Given the center of a circle, divide the circle into four equal arcs using a compass alone (a Mascheroni construction).
Napoleon's Problem
See also
Circle, Compass, Mascheroni ConstructionExplore with Wolfram|Alpha
References
Mascheroni, L. Geometria del compasso. 1797.Quemper de Lanascol, A. Géométrie du compas. Albert Blanchard, pp. 74-77, 1925.Schwerin. Mascheronische Konstruktionen. 1898.Referenced on Wolfram|Alpha
Napoleon's ProblemCite this as:
Weisstein, Eric W. "Napoleon's Problem." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/NapoleonsProblem.html