What about this one a tennis ball has a radius of 1.25 inches. The outside of a tennis ball is covered with felt. How many square inches of felt, to the nearest square inch, does it take to cover a tennis ball?
Accepted Solution
A:
The surface area of a sphere is given by the formula .. A = 4π*r^2 .. A = 4π*(1.25 in)^2 ≈ 20 in^2