whats the diameter of 7.85pi

Question

its . amath problem

 

Answer 1

As Carol noted, you have not told us what is represented by 7.85π ::

 

If d = 7.85pi then d = 7.85(3.14) = 24.66

If 7.85pi is the circumference:
2πr = 7.85
πd = 7.85
d = 7.85/π = 2.5

If 7.85π is the area then:
πr2 = 7.85
r2 = 7.85/π
r2 = 2.5
r = √2.5
r = 1.6
d = 2r = 3.2