Fourth Circle Theorem: Cycling Quadrilaterals - GCSE, IGCSE, GCE OL


Circle Theorem 4: GCSE, IGCSE and OL maths

Cyclic Quadrilaterals
A quadrilateral whose vertices touch a circle is called a cyclic quadrilateral. 

Fourth Circle Theorem

The opposite angles of a cyclic quadrilateral add up to 1800.

You can practise it interactively with the following applet:


Popular posts from this blog