the diameter of the circle is,
D = 7 ft
radius r = D/2 = 7/2
so the radius is r = 7/2
the circumference of the circle is
= 2 x pi x r
= 2 x 22/7 x 7/2
= 22
so the answer is appox 22 or 21.98
thus, the answer is 21.98 ft option b
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