Remember the Circle Equation.
C = pi d
Algebraically rearrange
d = C/pi
d = 78.5 m / 3.141592.... =
d = 24.98732607....
d ~ 24.99 m
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Assuming the court is apprx 1.8 times as long as it is wide (appx standard): x*y=78.5 x=y*1.8 1.8*y*y=78.5 78.5/1.8=785/18=43.6111111 Assuming that the circle's diameter is as wide as the court is the circle's diameter should be: 785/18 ft
50*pi*500 = 78539.81634centimeters or 785 meters, correct to three significant figures.
I suggest you convert them all to a common unit (for instance, convert everything to meters). Then you can easily compare them.
The positive integer factors of 785 are: 1, 5, 157, 785 The prime factors of 785 are: 5, 157
3/5 of 785 is 471.