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

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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:



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