MathDB

4

Part of 1976 Polish MO Finals

Problems(1)

perp. diagonals in a quad

Source: Polish MO Finals 1976 p4

8/23/2024
The diagonals of some quadrilateral with sides a,b,c,da,b,c,d are perpendicular. Prove that the diagonals of any other quadrilateral with sides a,b,c,da,b,c,d also are perpendicular
geometryperpendicular