Fixed Compass drawing Smaller Circle/Solution 2
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Problem
How can a rusty compass be used to draw a circle whose radius is smaller than that of the compass opening?
Solution
The point of the compass is placed at the apex of a right circular cone, and the circle is drawn on its surface.
$\blacksquare$
Historical Note
This puzzle is typical of those found in collections of Victorian amusements.
Sources
- 1992: David Wells: Curious and Interesting Puzzles ... (previous) ... (next): Henry van Etten: $120$