New posts in Plane Geometry

Are point sets of the same order type connected by continuous (order type)-preserving motion?

Pinball on the infinite plane

Original proof of Pappus' Hexagon Theorem

Convex curves with many inscribed triangles maximizing perimeter

Isoperimetric-like inequality for non-connected sets

Dissecting a square

Polynomial roots and convexity

Are Penrose tilings universal? Do aperiodic universal tilings exist?

What upper bounds are known for the diameter of the minimum spanning tree of $n$ uniformly random points in $[0,1]^2$?

How fast are a ruler and compass?