Question 25 Find the area of circle whose circumference is 22 cm.
Given that
Circumference = 2πr
22 = 2πr
22 = 2 × 22/7 × r
22 × 1/2×(7 )/22 = r
7/2 = r
r = 7/2 cm
Now,
Area of circle = πr2
= 22/7×(7/2)^2
= 22/7×(7 × 7)/(2 × 2)
= 11/1×7/2
= 77/2
= 38.5 cm2

CBSE Class 10 Sample Paper for 2020 Boards - Maths Basic

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 10 years. He provides courses for Maths and Science at Teachoo.