Question

Calculate the circumference of a circle if it's radius is 21 cm.​

Answer 1

Answer:

Given:-

r=21 cm

Formula used:-

$C=2\pi \: r$

Solution:-

$C=2 \times \frac{22}{7} \times 21cm$

= 132cm

More information:-

$Area \: \: of \: \: circle=\pi \: {r}^{2}$

Answer 2

Answer:

Formula- perimeter of cirlce= 2πr

always the value of π is 22/7

22/7× 2×21= 132 cm²

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