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

The reason interior angles in a quadrilateral sum to 360° is because a quadrilateral can be divided into two triangles. The interior angles in each triangle sum to 180° so two triangles together ...

A Lower Bound on the Angles of Triangles Constructed by Bisecting the Longest Side Ivo G. Rosenberg and Frank Stenger Mathematics of Computation , pp. 390-395 (6 pages) ...

Area of Triangle Formula: In this article, we cover the definition of triangle and its various types based on the angles and length of side. Besides, we will see how to calculate the area of a ...