A fun fact about quadrilaterals, provable via some simple high school geometry, for your reading pleasure.

Learn about angles in triangles and quadrilaterals with this BBC Bitesize Maths article. For students between the ages of 11 and 14.

Triangles and QuadrilateralsKeep Learning Grade 4 Math #14: Triangles and Quadrilaterals 06/09/2020 | 14m 54s | ...

The classification of shapes in middle and high school geometry often seems very mysterious to students, featuring strange terms such as isosceles, trapezoids, and kites, which are defined by a ...