NCERT CBSE Class 9th Maths Video Solutions
Tricks to solve questions around Heron’s formula, Circles, Probability, Triangles, Polynomials and more in 2 minutes. NCERT Solutions for Class 9th Maths. All chapters covered for CBSE Class 9th Maths. New Videos uploaded every week. Understand the concepts and solutions through 2minute videos

NCERT Class 9 Math Chapter 12: Heron's Formula  Area of Scalene Triangle  CBSE Important Questions
To calculate the perimeter of a triangle, we simply add the lengths of the sides given
Perimeter = a + b + c, where ""a"", ""b"", and ""c"" are the three different sides.
In this video, we will use the Heron's formula to calculate the area of a triangle. Students are advised to watch the entire video to get indepth understanding of the topic.
SpeEdLabs is India's leading adaptive practice platform, and is used by more than 60,000 students across 200+ cities in India. Students are able to access concept based content on SpeEdLabs YouTube channel and can also download the app that enables them to supplement learning that happens in schools/coaching centers.
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NCERT Class 9 Math Chapter 12: Heron's Formula  Area of Equilateral Triangle  CBSE Imp Questions
To calculate the perimeter of a triangle, we simply add the lengths of the sides given
Perimeter = a + b + c, where ""a"", ""b"", and ""c"" are the three different sides.
In order to find the area of a triangle with 3 sides, we use the Heron's formula. Students are advised to watch the entire video to get indepth understanding of the topic.
SpeEdLabs is India's leading adaptive practice platform, and is used by more than 60,000 students across 200+ cities in India. Students are able to access concept based content on SpeEdLabs YouTube channel and can also download the app that enables them to supplement learning that happens in schools/coaching centers.
Students can access any of these, round the clock:
✅ 20,000+ Concepts Covered for Math/Science for Grade 6th to Competitive Levels
✅ 5,000+ Video Based Solutions
✅ 2,50,000+ MCQ Answers with solutions
✅ Unlimited Practice Papers / Revision Papers basis on Skill & Weak Areas
Students can also connect with Mentors 24/7 for doubt clearing, and revise at their own pace, using personalised worksheets. For more details on how to access this platform, call up now at +18004198902  +91 9136668684  +912241203067
You can also email us at [email protected]
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NCERT Class 9 Math Chapter 12: Heron's Formula  Cloth required for Umbrella  CBSE Imp Questions
To calculate the perimeter of a triangle, we simply add the lengths of the sides given
Perimeter = a + b + c, where ""a"", ""b"", and ""c"" are the three different sides.
In this video, we will use the Heron's formula to calculate the area of a triangle. Students are advised to watch the entire video to get indepth understanding of the topic.
SpeEdLabs is India's leading adaptive practice platform, and is used by more than 60,000 students across 200+ cities in India. Students are able to access concept based content on SpeEdLabs YouTube channel and can also download the app that enables them to supplement learning that happens in schools/coaching centers.
Students can access any of these, round the clock:
✅ 20,000+ Concepts Covered for Math/Science for Grade 6th to Competitive Levels
✅ 5,000+ Video Based Solutions
✅ 2,50,000+ MCQ Answers with solutions
✅ Unlimited Practice Papers / Revision Papers basis on Skill & Weak Areas
Students can also connect with Mentors 24/7 for doubt clearing, and revise at their own pace, using personalised worksheets. For more details on how to access this platform, call up now at +18004198902  +91 9136668684  +912241203067
You can also email us at [email protected]
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NCERT Class 9 Mathematics Chapter 10: Circles  Angle in a Semicircle  CBSE Important Questions
The angle at the centre ∠AOB is twice the angle at the circumference ∠APB
As ∠AOB is 180°, it follows that ∠APB is 90°.
AOB is the diameter of the circle, so it follows that the angle in a semicircle is always a right angle. Angle in a semicircle is a right angle.
Students are advised to watch the entire video to get indepth understanding of the topic.
SpeEdLabs is India's leading adaptive practice platform, and is used by more than 60,000 students across 200+ cities in India. Students are able to access concept based content on SpeEdLabs YouTube channel and can also download the app that enables them to supplement learning that happens in schools/coaching centers.
Students can access any of these, round the clock:
✅ 20,000+ Concepts Covered for Math/Science for Grade 6th to Competitive Levels
✅ 5,000+ Video Based Solutions
✅ 2,50,000+ MCQ Answers with solutions
✅ Unlimited Practice Papers / Revision Papers basis on Skill & Weak Areas
Students can also connect with Mentors 24/7 for doubt clearing, and revise at their own pace, using personalised worksheets. For more details on how to access this platform, call up now at +18004198902  +91 9136668684  +912241203067
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NCERT Class 9 Math Chapter 10: Circles  Distance of Chord from Center  CBSE Important Questions
If the length of the radius and distance between the center and chord is known, then the formula to find the length of the chord is given by,
Length of a chord =2√((r^2d^2 ) )
Where r= the radius of a circle and d= the perpendicular distance from the center of a circle to the chord. Students are advised to watch the entire video to get indepth understanding of the topic.
SpeEdLabs is India's leading adaptive practice platform, and is used by more than 60,000 students across 200+ cities in India. Students are able to access concept based content on SpeEdLabs YouTube channel and can also download the app that enables them to supplement learning that happens in schools/coaching centers.
Students can access any of these, round the clock:
✅ 20,000+ Concepts Covered for Math/Science for Grade 6th to Competitive Levels
✅ 5,000+ Video Based Solutions
✅ 2,50,000+ MCQ Answers with solutions
✅ Unlimited Practice Papers / Revision Papers basis on Skill & Weak Areas
Students can also connect with Mentors 24/7 for doubt clearing, and revise at their own pace, using personalised worksheets. For more details on how to access this platform, call up now at +18004198902  +91 9136668684  +912241203067
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NCERT Class 9 Mathematics Chapter 10 : Circles  Angle in same segment subtend equal angle
A cyclic quadrilateral is a quadrilateral whose all the vertices lie on a single circle. In a cyclic quadrilateral, the sum of opposite angles is equals to 180 degree. In the video, angle CAD and angle DBC would be equal as angles in same segment subtend equal angles.
Now, angle DAB will be equal to the sum of angle CAD and BAC. Using angle DAB, we will find angle BCD (sum of opposite angles in cyclic quadrilateral is 180 degree). Students are advised to watch the entire video to get indepth understanding of the topic.
SpeEdLabs is India's leading adaptive practice platform, and is used by more than 60,000 students across 200+ cities in India. Students are able to access concept based content on SpeEdLabs YouTube channel and can also download the app that enables them to supplement learning that happens in schools/coaching centers.
Students can access any of these, round the clock:
✅ 20,000+ Concepts Covered for Math/Science for Grade 6th to Competitive Levels
✅ 5,000+ Video Based Solutions
✅ 2,50,000+ MCQ Answers with solutions
✅ Unlimited Practice Papers / Revision Papers basis on Skill & Weak Areas
Students can also connect with Mentors 24/7 for doubt clearing, and revise at their own pace, using personalised worksheets. For more details on how to access this platform, call up now at +18004198902  +91 9136668684  +912241203067
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NCERT Solution for Class 9th MATHS Probability Q5
The probability of an event is a number between 0 and 1, where 0 indicates impossibility of the event and 1 indicates certainty. Probability can be calculated using a simple formula : number of required outcomes upon total number of outcomes. In this question sample space is 36 and desired outcomes in first part is 6, (1 , 1) , (2 , 2) , (3 , 3) (4 , 4) , (5 , 5) and (6 , 6).
For the second part, we just need to substract the andwer obtained in part I by 1 (as total probability of two complementary events is equals to one). Students are advised to watch the entire video to get indepth understanding of the topic.
SpeEdLabs is India's leading adaptive practice platform, and is used by more than 60,000 students across 200+ cities in India. Students are able to access concept based content on SpeEdLabs YouTube channel and can also download the app that enables them to supplement learning that happens in schools/coaching centers.
Students can access any of these, round the clock:
✅ 20,000+ Concepts Covered for Math/Science for Grade 6th to Competitive Levels
✅ 5,000+ Video Based Solutions
✅ 2,50,000+ MCQ Answers with solutions
✅ Unlimited Practice Papers / Revision Papers basis on Skill & Weak Areas
Students can also connect with Mentors 24/7 for doubt clearing, and revise at their own pace, using personalised worksheets. For more details on how to access this platform, call up now at +18004198902  +91 9136668684  +912241203067
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NCERT Solution for Class 9th MATHS  Probability  Q6
The probability of an event is a number between 0 and 1, where 0 indicates impossibility of the event and 1 indicates certainty. Probability can be calculated using a simple formula : number of required outcomes upon total number of outcomes. In this question sample space is 36 and desired outcomes in first part is 6, (1 , 1) , (2 , 2) , (3 , 3) (4 , 4) , (5 , 5) and (6 , 6).
For the second part, we just need to substract the andwer obtained in part I by 1 (as total probability of two complementary events is equals to one). Students are advised to watch the entire video to get indepth understanding of the topic.
SpeEdLabs is India's leading adaptive practice platform, and is used by more than 60,000 students across 200+ cities in India. Students are able to access concept based content on SpeEdLabs YouTube channel and can also download the app that enables them to supplement learning that happens in schools/coaching centers.
Students can access any of these, round the clock:
✅ 20,000+ Concepts Covered for Math/Science for Grade 6th to Competitive Levels
✅ 5,000+ Video Based Solutions
✅ 2,50,000+ MCQ Answers with solutions
✅ Unlimited Practice Papers / Revision Papers basis on Skill & Weak Areas
Students can also connect with Mentors 24/7 for doubt clearing, and revise at their own pace, using personalised worksheets. For more details on how to access this platform, call up now at +18004198902  +91 9136668684  +912241203067
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NCERT Solution for Class 9th MATHS  Probability  Q7
The probability of an event is a number between 0 and 1, where 0 indicates impossibility of the event and 1 indicates certainty. Probability can be calculated using a simple formula : number of required outcomes upon total number of outcomes. In this question sample space is 36 and desired outcomes in first part is 6, (1 , 1) , (2 , 2) , (3 , 3) (4 , 4) , (5 , 5) and (6 , 6).
For the second part, we just need to substract the andwer obtained in part I by 1 (as total probability of two complementary events is equals to one). Students are advised to watch the entire video to get indepth understanding of the topic.
SpeEdLabs is India's leading adaptive practice platform, and is used by more than 60,000 students across 200+ cities in India. Students are able to access concept based content on SpeEdLabs YouTube channel and can also download the app that enables them to supplement learning that happens in schools/coaching centers.
Students can access any of these, round the clock:
✅ 20,000+ Concepts Covered for Math/Science for Grade 6th to Competitive Levels
✅ 5,000+ Video Based Solutions
✅ 2,50,000+ MCQ Answers with solutions
✅ Unlimited Practice Papers / Revision Papers basis on Skill & Weak Areas
Students can also connect with Mentors 24/7 for doubt clearing, and revise at their own pace, using personalised worksheets. For more details on how to access this platform, call up now at +18004198902  +91 9136668684  +912241203067
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NCERT Solution for Class 9th MATHS  Probability  Q8
The probability of an event is a number between 0 and 1, where 0 indicates impossibility of the event and 1 indicates certainty. Probability can be calculated using a simple formula : number of required outcomes upon total number of outcomes. In this question sample space is 36 and desired outcomes in first part is 6, (1 , 1) , (2 , 2) , (3 , 3) (4 , 4) , (5 , 5) and (6 , 6).
For the second part, we just need to substract the andwer obtained in part I by 1 (as total probability of two complementary events is equals to one). Students are advised to watch the entire video to get indepth understanding of the topic.
SpeEdLabs is India's leading adaptive practice platform, and is used by more than 60,000 students across 200+ cities in India. Students are able to access concept based content on SpeEdLabs YouTube channel and can also download the app that enables them to supplement learning that happens in schools/coaching centers.
Students can access any of these, round the clock:
✅ 20,000+ Concepts Covered for Math/Science for Grade 6th to Competitive Levels
✅ 5,000+ Video Based Solutions
✅ 2,50,000+ MCQ Answers with solutions
✅ Unlimited Practice Papers / Revision Papers basis on Skill & Weak Areas
Students can also connect with Mentors 24/7 for doubt clearing, and revise at their own pace, using personalised worksheets. For more details on how to access this platform, call up now at +18004198902  +91 9136668684  +912241203067
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NCERT Class 9 Mathematics Chapter 15: ProbabilityNo. of Bad eggs  CBSE Important Questions
The probability of an event is a number between 0 and 1, where 0 indicates impossibility of the event and 1 indicates certainty.
In this video, we are given the probability of getting a bad egg and the total number of eggs. Using these two values and the formula of probability, we can easily find the number of bad eggs (by multipling probability to the total number of eggs).
Students are advised to watch the entire video to get indepth understanding of the topic.
SpeEdLabs is India's leading adaptive practice platform, and is used by more than 60,000 students across 200+ cities in India. Students are able to access concept based content on SpeEdLabs YouTube channel and can also download the app that enables them to supplement learning that happens in schools/coaching centers.
Students can access any of these, round the clock:
✅ 20,000+ Concepts Covered for Math/Science for Grade 6th to Competitive Levels
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✅ 2,50,000+ MCQ Answers with solutions
✅ Unlimited Practice Papers / Revision Papers basis on Skill & Weak Areas
Students can also connect with Mentors 24/7 for doubt clearing, and revise at their own pace, using personalised worksheets. For more details on how to access this platform, call up now at +18004198902  +91 9136668684  +912241203067
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NCERT Solution for Class 9th MATHS Probability Q2
The probability of an event is a number between 0 and 1, where 0 indicates impossibility of the event and 1 indicates certainty. Probability can be calculated using a simple formula : number of required outcomes upon total number of outcomes. In this video, the sample space is 40, and the number of tickets which are multiple of five from 1 to 40 is 8. So, total number of required outcomes are 8 and total number of possible outcomes are 40. Students are advised to go through the entire video for an indepth understanding of the topic.
SpeEdLabs is India's leading adaptive practice platform, and is used by more than 60,000 students across 200+ cities in India. Students are able to access concept based content on SpeEdLabs YouTube channel and can also download the app that enables them to supplement learning that happens in schools/coaching centers.
Students can access any of these, round the clock:
✅ 20,000+ Concepts Covered for Math/Science for Grade 6th to Competitive Levels
✅ 5,000+ Video Based Solutions
✅ 2,50,000+ MCQ Answers with solutions
✅ Unlimited Practice Papers / Revision Papers basis on Skill & Weak Areas
Students can also connect with Mentors 24/7 for doubt clearing, and revise at their own pace, using personalised worksheets. For more details on how to access this platform, call up now at +18004198902  +91 9136668684  +912241203067
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NCERT Class 9 Maths Sample Papers
Get free NCERT past year papers for class 9. SpeedLabs provides the past year papers for Class 9 which would help all the students in preparing for exams.