Henry Ernest Dudeney/Puzzles and Curious Problems/188 - Squaring the Circle/Solution 1

by : $188$

 * Squaring the Circle

Solution
Make a rectangle with one side equal to the diameter and one side $3$ times the diameter.

Then take the diagonal of this rectangle.

This will be quite close to the circumference, as it is $\sqrt {10}$ or approximately $3.162$ times the diameter.