Question

if circumference is 12 cm then find its area
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Answer 1

Answer:

C=12cm

as, C=2πr

so, 2πr=12

r=6/π

now, as area of circle=πr²

so, area=π(6/π)(6/π)

=36/π

=36/3.141 (taking π=3.141)

Area =11.461 sq. cm

Answer 2

$circumference = 2\pi r \\12 = 2\pi r \\ r = \frac{6}{\pi} \\ \\ area =\pi {r}^{2} \\ area = \pi \times { (\frac{6}{\pi} )}^{2} \\ area = \frac{36}{\pi} \\ area = \frac{36 \times 7}{22} \\ area = \frac{126}{11} \\ area = 11.45c {m}^{2}$

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