New posts in Plane Geometry

Sum of squared inner product of vector with spokes around unit circle is constant

$n$ lines in a plane, proper coloring of intersection points with just 3 colors

Find angle UFO in the picture attached

The longer the base, the longer the hypotenuse

A variant of Heron's shortest distance problem (with three points instead of two)

How to intersect a line with a point off the page using a straight edge and compass (see description)

Hole in the axioms of Hartshorne's "Foundations of Projective Geometry"?

Two individuals are walking around a cylindrical tower. What is the probability that they can see each other?

Six points lie on a circle

Maximum Number of Regions in the Plane Using Zig Lines?