Radius and chord rule for circles

Circle theorems

Shape

Understand that if a radius bisects a chord, then it does so perpendicularly (and visa versa). Explain why the radius bisects the chord if the radius and chord are perpendicular (can be done by Pythagoras to show the 3rd length in each triangle is equal and therefore the chord is bisected) or by congruent triangles using RHS rule
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