Stars indicate closer matches.
Lie sphere geometry
Angle trisection
Bride's Chair
Doubling the cube
Garfield's proof of the Pythagorean theorem
Geometric mean theorem
Golden ratio
Hsuan thu
Pythagorean theorem
Square trisection
Squaring the circle
De Bruijn–Erdős theorem (incidence geometry)
Mutually unbiased bases
Projective plane
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