Step-by-step explanation:
the angles are supplementary to the angle in the diagram is Angle BCF
Answer:

Step-by-step explanation:
Multiply the fraction by the conjugate and solve (would explain more but you're on a time crunch)
R = sqrt 3 * (V /( pi * h))
V = 62.8
pi = 3.14
h = 15
now we sub
R = sqrt 3 * (62.8 / (3.14 * 15)
R = sqrt 3 * (62.6 / 47.1)
R = sqrt 3 * 1.33
R = sqrt 3.99
R = 1.9 rounds to 2 inches <===
I searched the answer up becuase I didn’t know how they got the number but I hope this helps