If the area of a circle is 154 cm ^{ 2 } , then its perimeter is
(A) 11 cm (B) 22 cm (C) 44 cm (D) 55 cm
Last updated at Aug. 19, 2021 by Teachoo
Transcript
Question 1 If the area of a circle is 154 cm2, then its perimeter is (A) 11 cm (B) 22 cm (C) 44 cm (D) 55 cm Now, Area of circle = ๐r2 154 = ๐๐/๐ ร r2 154 ร 7/22 = r2 7 ร 7 = r2 49 = r2 r2 = 49 r2 = 72 r = 7 cm Now, Perimeter = 2๐r = 2 ร 22/7 ร 7 = 2 ร 22 = 44 cm So, the correct answer is (C)
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