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Printjmc
geometry senior
Problem
The volume of a cylinder is 60 cubic centimeters. What is the number of cubic centimeters in the volume of the sphere it circumscribes?
Solution
We begin by drawing a diagram:
Let the radius of the sphere be . We see the radius of the cylinder is and the height of the cylinder is . Thus, from the cylinder's volume we have Dividing both sides by 2 yields . The volume of the sphere is cubic centimeters. (Notice that we didn't have to solve for !)
Let the radius of the sphere be . We see the radius of the cylinder is and the height of the cylinder is . Thus, from the cylinder's volume we have Dividing both sides by 2 yields . The volume of the sphere is cubic centimeters. (Notice that we didn't have to solve for !)
Final answer
40