A bisector is a line which cuts another line exactly in half. An angle bisector cuts an angle into two angles of equal size. It can be constructed using a ruler and a pair of compasses. To ...

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?

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