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

The triangle angle sum theorem makes working with triangles easy. What happens when you can’t rely on it?

For an octahedron, the angles of the 4 triangles add up to equal 240 degrees, and for an icosahedron there are 300 degrees where the 5 triangles meet at each vertex.

Executed well, the triangle allowed for better spacing and unique angles from which to attack the rim area, and since there is little difference in efficiency between an 8-footer and an 18-footer ...

Ivo G. Rosenberg, Frank Stenger, A Lower Bound on the Angles of Triangles Constructed by Bisecting the Longest Side, Mathematics of Computation, Vol. 29, No. 130 (Apr., 1975), pp. 390-395 ...

A 3,700-year old Babylonian clay tablet reveals an ancient method of constructing right-angled triangles that makes it the world’s oldest and most accurate trigonometric table.

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