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Maths-

General

Easy

Question

Find the circumference of the circle whose diameter is 21 cm.

hint Hint:

Circumference of circle = 2 p r

The correct answer is: 65.94 cm

It is given that diameter of circle = 21 cm
$rightwards double arrow$ Radius = $fraction numerator d i a m e t e r over denominator 2 end fraction$
= $21 over 2$ cm
Circumference = 2 $pi$ r
= 2 (3.14) $21 over 2$
( $therefore$ $straight pi$ = 3.14 )
= (3.14) 21
= 65.94 cm

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