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https://amsi.org.au/teacher_modules/Circle_Geometry.html

The **perpendicular bisector** of the chord AB. ... **Theorem**. An angle in a semicircle

is a right angle. **Proof**. Let AB be a diameter of a circle with centre O, ... For

**example**, a circle can be defined as the locus of a point that moves so that its

distance from some fixed point ..... i are one inside the other, ii touch internally, **iii**

overlap,

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