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Tuesday, February 17, 2015

Right Circular Cylinder Problems, 23

Category: Solid Geometry

"Published in Vacaville, California, USA"

How many washers can be made from a cube of metal 4 in. on a side, if the washers are ⅝ in. in diameter and ⅛ in. thick? The hole in the center of the washers is ¼ in. in diameter.

Solution:

To illustrate the problem, it is better to draw the figure as follows

Photo by Math Principles in Everyday Life

The volume of a washer which is a concentric right circular cylinder is







Therefore, the number of washers that can be made from a block of cube of metal 4 in. on a side is