1 Answer

Daniele Ceglia · Answer 1 · 2023-04-30T20:39:45+0000

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:

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