Question

the diameter of a cirle is 21m. Find its circumference​

Answer 1

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Diameter of circle= 21 m

Radius= Diameter/2= 21/2= 10.5m

Circumference=

$\sf2\pi r = 2 \times \frac{22}{7} \times 10.5 \\ \\ \implies2 \times \frac{ \cancel{22 {} \: }^{11} }{ \cancel7} \times \frac{ \cancel{105 {}}^{ \: \cancel{ 21 {} \: }^{3} } }{ \cancel{10 {} \: }^{ \cancel{5}} } = 66$

So circumference of given circle is 66 m

Hope it helps you....

Answer 2

Answer:

66

Step-by-step explanation:

circumference of circle= πD

                                       = (22/7) into 21

                                       = 462/7

                                       =66

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