Question: A triangle, ABC, is inscribed in a circle, centre O, with AOC as a diameter of the circle. Take OA(vector) = a and OB =

A triangle, ABC, is inscribed in a circle, centre O, with AOC as a diameter of the circle. Take OA(vector) = a and OB = b. By evaluating AB(vector) ·CB (vector) show that angle ABC is a right angle.

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