# Ex 11.3, 1 - 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, 1 Find the circumference of the circles with the following radius: (๐๐๐๐ ๐=22/7) (a) 14 cm Radius = r = 14 cm Circumference = 2๐r = 2 ร 22/7 ร 14 = 2 ร 22/1 ร 2 = 44 ร 2 = 88 cm โด Circumference of circle is 88 cm Ex 11.3, 1 Find the circumference of the circles with the following radius: (๐๐๐๐ ๐=22/7) (b) 28 mm Radius = r = 28 mm Circumference = 2๐r = 2 ร 22/7 ร 28 = 2 ร 22 ร 4 = 44 ร 4 = 176 cm โด Circumference of circle is 176 mm Ex 11.3, 1 Find the circumference of the circles with the following radius: (๐๐๐๐ ๐=22/7) (c) 21 cm Radius = r = 21 cm Circumference = 2๐r = 2 ร 22/7 ร 21 = 2 ร 22 ร 3 = 44 ร 3 = 132 cm โด Circumference of circle is 132 cm

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Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.