# Ex 11.3, 2 - 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, 2 Find the area of the following circles, given that: (a) radius = 14 mm (๐๐๐๐ ๐=22/7) Radius = r = 14 mm Area of circle = ๐ r2 = 22/7 ร (14)2 = 22/7 ร 14 ร 14 = 22 ร 2 ร 14 = 44 ร 14 = 616 mm2 โด Required area is 616 mm2 Ex 11.3, 2 Find the area of the following circles, given that: (b) diameter = 49 m Diameter = 21 cm Radius = r = ๐ท๐๐๐๐๐ก๐๐/2 = 49/2 m Now, Area of circle = ๐ r2 = 22/7 ร (49/2)^2 = 22/7 ร 49/2 ร 49/2 = 11/7 ร 49/1 ร 49/2 = 11/1 ร 7 ร 49/2 = (77 ร 49)/2 = 3773/2 = 1886.5 m2 โด Required area is 1886.5 m2 Ex 11.3, 2 Find the area of the following circles, given that: (c) radius = 5 cm Radius = r = 5 cm Area of circle = ๐ r2 = 22/7 ร (5)2 = 22/7 ร 25 = 550/7 cm2 โด Area is ๐๐๐/๐ cm2

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