Question

What will be the circumference of circle of diameter of 21 CM.

Answer 1

Answer:

Here,

d=21cm

=> r = 21/2cm

Circumference of a circle =

$2\pi r$

= 2 × 22/7 × 21/2

= 22 × 3

= 66cm Ans.

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Answer 2

Answer:

Diameter = 21

Radius = 10.5

Circumference = 2πr

2×22÷7×10.5 =66cm