Find the center of the circle using only the drafting triangle and pencil as shown.
Puzzle provided by Kordemsky: The Moscow Puzzles (Dover)
Solution: Place C, the right angle of the drafting triangle on the circumference, as shown. D and E, where the triangle’s legs cross the circumference, are the endpoints of a diameter. Draw it, and get a second diameter the same way. The intersection is the center of the circle.
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