MathDB

1

Part of 1967 Swedish Mathematical Competition

Problems(1)

no of rectangles by p // lines and q perpendicular to them

Source: 1967 Swedish Mathematical Competition p1

3/21/2021
pp parallel lines are drawn in the plane and qq lines perpendicular to them are also drawn. How many rectangles are bounded by the lines?
combinatorial geometrycombinatoricsrectanglelines