Prince Ruperts Cube
This construction shows that it is possible to make a hole in a cube, through which a larger cube can pass! The points on the sides that define the cut-out are placed 3/4 of the way from one coner to the next.
Tyukayev, Stephanie - Perpendicular Bisector
Discovering the Pythagorean Theorem
large angle of triangle
Isabelle Garand_equilateral triangle