Surface Areas and Volumes,

NCERT Solutions for Class 9 Maths Chapter 13

Important NCERT Questions

Surface Areas and Volumes

NCERT Books for Session 2022-2023

CBSE Board, UP Board and Other state Boards

EXERCISE 13.3

Page No:221

Questions No:7

Get here all the solutions of class 9 Maths Exercise 11.1 Question 7

https://www.tiwariacademy.com/ncert-solutions/class-9/maths/chapter-11/

Video Solution:

Radius of right circular cone r = 7 cm and height h = 24 cm

Let, the slant height = l m

We know that l² = r² + h²

⇒ l² = 7² + 24² = 49 + 576 = 625

⇒ l = √625 = 25 cm

Area of sheet required to make 1 cap = πrl

= 22/7 ×7 × 25 = 550 cm²

Therefore, area of sheet required to make 10 such caps = 10 × 550 = 5500 cm²

Hence, area of sheet to make 10 such caps is 5500 cm²

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