The area of a circle is 1386 m^2. Find its circumference.

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RRB TC CC Exam (Bangalore) 2007 click here to view all questions

The area of a circle is 1386 m^2. Find its circumference.

A444 m

B70 m

C132 m

D19 m

Nithin K ? Sun Sep 25 2016 12:30:00 GMT+0530 (IST)

Given area of circular field is 1386 m2
But area of circle = πr²
∴ πr² = 1386
r² = \(1386 \times 7 \over 22 \)

r²= 441 m

r = \(\sqrt{441} \)m
∴  r = 21 m
Circumference of the field = 2πr = 2 x \(22 \over 7\)x 21 = 132m.

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Given area of circular field is 1386 m2 But area of circle = πr2 ∴ πr2 = 1386 r2 = \(1386 \times 7 \over 22 \) r2= 441 m r = \(\sqrt{441} \)m ∴  r = 21 m Circumference of the field = 2πr = 2 x \(22 \over 7\)x 21 = 132m. Nithin K ? answered Sun Sep 25 2016 12:30:00 GMT+0530 (IST) All Comments

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