# Eighth Circle Theorem: 'Perpendicular bisects the chord'

**Eighth circle theorem: 'Perpendicular bisects the chord'**[this is a test version - I want to put a number of Circle Theorem ggb pages here, & am finding out how it all works!!] You are here: Home > Maths intro > Circle theorems first page > Perpendicular & chord Perpendicular & chord Perpendicular from the centre ,A, cutting a chord of the circle. CD is the chord, and AE is perpendicular to it. Move C or D, and note the connection between lengths CE and DE. If you want to alter the size of the circle, move A or B.

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