# An Example of the Bolyai-Gerwien Theorem

An Example of the Bolyai-Gerwien Theorem

This conceptual design can be used to demonstrate the Bolyai–Gerwien theorem in the case of triangles and rectangles. A triangle is cut into four pieces that can be rotated to form a rectangle. (Henry Dudeney published this as a plane rearrangement puzzle in 1902.)