Respuesta :

21 is the feet so times that by 3.14 and the answer is 65.94.   your welcome:-)
The formula to find the circumference of a circle is= 2 * pi * r

So just plug in the numbers with the variables. c:
= 2 * pi * (21/2)
= 21 * pi
= 65.94 ft

So the answer is  65.94 ft
Hope this helps. c: