The triangles are similar with area 1 2 a b {\displaystyle {\tfrac {1}{2}}ab} , while the small square has side b − a and area (b − a)2.
Os triángulos son iguais de área 1 2 a b {\displaystyle {\tfrac {1}{2}}ab} , mentres que o cadrado pequeno central ten de lado b − a e área (b − a)2.