Let r be radius of the circle
Given
The Circumference of the circle = 63 feet
We know the circumference of the circle = 2 ×pi×r
Hence 2×pi×r = 63
2×22/7×r=63
2×r=63×7/22 by using cross product law
2×r= 441/22
2×r=22.045
2×r=22.05
Diameter= 22.05 since 2×r is diameter