Practice Summary - 11.5 | 11. Surface Areas And Volumes | CBSE 9 Mathematics
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11.5 - Summary

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Learning

Practice Questions

Test your understanding with targeted questions related to the topic.

Question 1

Easy

Find the curved surface area of a cone with radius 3 cm and slant height 4 cm.

💡 Hint: Use the formula C.S.A = πrl.

Question 2

Easy

What is the total surface area of a sphere with radius 5 cm?

💡 Hint: Recall the formula 4πr².

Practice 4 more questions and get performance evaluation

Interactive Quizzes

Engage in quick quizzes to reinforce what you've learned and check your comprehension.

Question 1

What is the formula for the total surface area of a cone?

  • πrl
  • πr(l + r)
  • 4πr²

💡 Hint: Think about the round shape and the flat base.

Question 2

True or False: The volume of a sphere is equal to 4/3πr³.

  • True
  • False

💡 Hint: Remember the fraction involved with the volume.

Solve and get performance evaluation

Challenge Problems

Push your limits with challenges.

Question 1

A cone has a height of 12 cm and a radius of 5 cm. Find its volume and total surface area.

💡 Hint: Use Pythagorean theorem to find the slant height first.

Question 2

If a sphere has a surface area of 400π cm², what is its radius and volume?

💡 Hint: Remember how to rearrange the surface area formula to solve for radius.

Challenge and get performance evaluation