Three old chestnuts in elementary geometry: is there a unified perspective?
40919
Finding an angle within an 80-80-20 isosceles triangle
106736
Poincaré maps and interpretation
22540
Bisecting line segments in a tetrahedron.
4667
Transformations from n-sphere coordinates to cartesian coordinates.
39948
Given a set of curved geodesics in 2D space, is there a way to determine the geometrical shape of said space?
9230
I'm researching about geometry non-Euclidean
126040
Geometric explanation of $\sqrt 2 + \sqrt 3 \approx \pi$
59754
Extended Euclidean Algorithm: backward vs. forward
111042
A geometry problem from high school Olympiad selection round
123442
Prerequisites for Algebraic Geometry
44811
Intersection of Common Chords of Three Circles
93635
Euclidean geometry in non-inertial frame
119304
Latin Square and Graph Theory
103778
Geometric interpretation of connection forms, torsion forms, curvature forms, etc
151326
Concurrency of the heights of a tetrahedron with opposite edges perpendicular.
30625
Does the square or the circle have the greater perimeter? A surprisingly hard problem for high schoolers
84686
Geometric Description Of a Set In The Complex Plane