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​Q11: Question – Paper 1 – June 2018
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Question
11)
A and B are points on a circle, centre O.

BC is a tangent to the circle.
AOC is a straight line.
Angle ABO = x°.

Find the size of angle ACB, in terms of x.
Give your answer in its simplest form.
​Give reasons for each stage of your working.
[5 marks]