# Ex 11.3, 3 - Chapter 11 Class 7 Perimeter and Area

Last updated at Dec. 12, 2018 by Teachoo

Last updated at Dec. 12, 2018 by Teachoo

Transcript

Ex 11.3, 3 If the circumference of a circular sheet is 154 m, find its radius. Also find the area of the sheet. (๐๐๐๐ ๐=22/7) Radius = r = ? Given, Circumference = 154 m 2๐r = 154 2 ร 22/7 ร r = 154 (2 ร 22)/7 ร r = 154 r = 154 ร 7/(2 ร 22) r = 77 ร 7/22 r = 7 ร 7/2 r = 49/2 r = 24.5 m Now, Area of circle = ๐r2 = 22/7 ร (24.5)^2 = 22/7 ร (49/2)^2 = 22/7 ร 49/2 ร 49/2 = 11/7 ร 49 ร 49/2 = 11 ร 7 ร 49/2 = 11 ร 343/2 = 3773/2 = 1886.5 m2 Therefore, Radius of circular sheet is 24.5 m & Area of circular sheet is 1886.5 m2

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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.