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

Transcript

Ex 11.3, 2 Find the area of the following circles, given that: (a) radius = 14 mm (๐‘‡๐‘Ž๐‘˜๐‘’ ๐œ‹=22/7) Radius = r = 14 mm Area of circle = ๐œ‹ r2 = 22/7 ร— (14)2 = 22/7 ร— 14 ร— 14 = 22 ร— 2 ร— 14 = 44 ร— 14 = 616 mm2 โˆด 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 = ๐ท๐‘–๐‘Ž๐‘š๐‘’๐‘ก๐‘’๐‘Ÿ/2 = 49/2 m Now, Area of circle = ๐œ‹ 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 โˆด 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œ‹ r2 = 22/7 ร— (5)2 = 22/7 ร— 25 = 550/7 cm2 โˆด Area is ๐Ÿ“๐Ÿ“๐ŸŽ/๐Ÿ• cm2

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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.