Question

. If the circumference of a circle is 4πr, what is its area?

a) 4πr2 b) 2πr2

c) 3πr2

d) πr2​

Answer 1

HEY MATE YOUR ANSWER IS HERE

$circumference \: of \: circle = 2\pi \: r \\ \\ hence \\ \\ 2\pi r = 4\pi r \\ \\ r = 2r \\ \\ \\ now \: area \: of \: circle \: = \pi {r}^{2} \\ = \pi(2r) ^{2} \\ = 4\pi {r }^{2} \\ \\ so \: option \: a \: is \: correct \:$

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