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Homework Statement:
 A golf ball has a diameter of 3cm and a dimple has a diameter of 0.3cm. Give a (reasonable) estimate for the largest number of dimples that can fit on the golf ball. Hint: The number of dimples is lower than 100.
Relevant Equations:

Area of the ball = 4*pi*R^2
R=1.5
r=0.15
The area of a dimple is the area of a spherical cap.
The approximate number of dimples is 1/(1√(1r^2/R^2))