Question

if the area of circle is 1386sq. cm find the circumference of the circl​

Answer 1

Answer:

Step-by-step explanation:

Area of circle=πr²

1386=22/7 X r²

1386 X 7/22=441

441=r²

r=√441

r=21

Circumference of circle⭕=2πr

2 X 22/7 X 21=132 ans

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Answer 2

$area \: of \: circle = \pi {r}^{2} \: \: \: \: \: \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: 1386 = \frac{22}{7} \times {r}^{2} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \frac{1386 \times 7} {22} = {r}^{2} \\ \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: 441 = {r}^{2} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: r = \sqrt{441} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: r = 21$

Circumference =2*22/7*21

=132 cm=1.32m

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