Question

the area of the circle is 98.56cm sq. Find its circumference.

Answer 1

Answer:

$\red { perimeter \:of \:the \:circle }\green { =35.2\:cm }$

Step-by-step explanation:

$Let \: radius \:of \:the \:circle = r \:cm$

$\boxed {\pink { Area \: of \:the \:circle (A)= \pi r^{2}}}$

$\implies \pi r^{2} = 98.56 \:(given)$

$\implies \frac{22}{7} \times r^{2} = 98.56$

$\implies r^{2} = 98.56 \times \frac{7}{22}$

$\implies r^{2} = 4.48 \times 7$

$\implies r^{2} = 31.36$

$\implies r = \sqrt{31.36} = 5.6 \:cm$

$\boxed {\orange { Perimeter \:of \:the \: Circle = 2\pi r}}$

$\implies P = 2\times \frac{22}{7} \times 5.6$

$= 2\times 22 \times 0.8 = 35.2 \:cm$

Therefore.,

$\red { perimeter \:of \:the \:circle }\green { =35.2\:cm }$

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Answer 2

Step-by-step explanation:

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