Slide8.JPG

Slide9.JPG
Slide10.JPG

  1. Chapter 11 Class 7 Perimeter and Area
  2. Serial order wise

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. (๐‘‡๐‘Ž๐‘˜๐‘’ ๐œ‹=22/7) Radius = r = ? Given, Circumference = 154 m 2๐œ‹r = 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 = ๐œ‹r2 = 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

About the Author

Davneet Singh's photo - Teacher, Computer Engineer, Marketer
Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.