Learn more about bisecting lines and angles with this BBC Bitesize Maths article. For students between the ages of 11 and 14.

The sum of the exterior angles of a polygon is 360°. The formula for calculating the size of an exterior angle in a regular polygon is: 360 ÷ number of sides.

In the “classical” adventitious angle problem, for a given set of three angles a, b, and c measured in integral degrees in an isosceles triangle, a fourth angle θ (the derived angle), also measured in ...

Victor Oxman, Two Cevians Intersecting on an Angle Bisector, Mathematics Magazine, Vol. 85, No. 3 (June 2012), pp. 213-215 ...