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

A quadrilateral is a four-sided shape, where the sides are straight and meet at four vertices. The prefix “quad” means four. There are several types of quadrilaterals. Can you name them?

• Sum of the angles of a quadrilateral is 360°. • A diagonal of a parallelogram divides it into two congruent triangles. • In a parallelogram, (i) opposite sides are equal ...