Pappus's_area_theorem
Pappus's area theorem
Relates areas of three parallelograms attached to three sides of an arbitrary triangle
Pappus's area theorem describes the relationship between the areas of three parallelograms attached to three sides of an arbitrary triangle. The theorem, which can also be thought of as a generalization of the Pythagorean theorem, is named after the Greek mathematician Pappus of Alexandria (4th century AD), who discovered it.