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Method 1: The standard method The centre is the mid-point of [ab]. ![]() The radius is the distance from the centre to a or b. ![]() ![]() The equation of the circle is: ![]() Method 2: The nifty method Trick: The angle in a semi-circle is ![]() Since ![]() ![]() ![]() This is the equation. Multiplying out gives: ![]() |
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