The circumference of a circle whose area is 81πr2, is(a) 9πr (b) 18� – InterviewSolution

1.

The circumference of a circle whose area is 81πr2, is(a) 9πr (b) 18πr (c) 3πr (d) 81πr

Answer»

(b) 18πr

Let us assume R be the radius of circle

We know that, area of circle = πR²

81πr² = πR²

R = √81 r

R = 9r

Circumference = 2 πr

= 2 π (9r)

= 18πr

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