New posts in Discrete Geometry

Can a row of five equilateral triangles tile a big equilateral triangle?

Set of diameter $\le 1$ contained in set of constant width $1$

Circle enclosing all but one of $n$ points

How many acute triangles can be formed by 100 points in a plane?

Largest rectangle not touching any rock in a square field

Can all circles of radius $1/n$ be packed in a unit disk, excluding the circle of radius $1/1$?

How to check whether a convex polyhedron is contained in another convex polyhedron?

Projection of a hypercube along a long diagonal. What is this polytope called?

Why is a circle in a plane surrounded by 6 other circles?

Decomposing square of side length $n$ into $n$ squares in a certain "maximal" way