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Find the circumference of each circle .(use 22/7 as an approximation for PI

Find the circumference of each circle .(use 22/7 as an approximation for PI-example-1

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Let us find the circumference of each circle.

The circumference of a circle is given by


C=2\pi r\: \: or\: \: C=\pi D

Where r is the radius and D is the diameter of the circle.

Circle 1:

Here we are given the diameter of the circle

D = 21 cm


C=\pi D=(22)/(7)\cdot21=22\cdot3=66\operatorname{cm}

So, the circumference of the circle is 66 cm.

Circle 2:

Here we are given the diameter of the circle

D = 91 ft


C=\pi D=(22)/(7)\cdot91=286\: ft

So, the circumference of the circle is 286 ft.

Circle 3:

User Daniele Ceglia
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