8.4

Part of 2003 All-Russian Olympiad Regional Round

Problems(1)

cut triangle into 3 polygons - All-Russian MO 2003 Regional (R4) 8.4

Source:

Prove that an arbitrary triangle can be cut into three polygons, one of which must be an obtuse triangle, so that they can then be folded into a rectangle. (Turning over parts is possible).

geometrycombinatorial geometrycombinatoricsobtuse