Edexcel Gcse Mathematics (Linear) - Circle Theorems Page 5
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127.
In the diagram, O is the centre of the circle.
A and C are points on the circumference of the circle.
BCO is a straight line.
BA is a tangent to the circle.
AB = 8 cm.
OA = 6 cm.
(a) Explain why angle OAB is a right angle.
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(1)
(b) Work out the length of BC.
................................cm
(3)
(4 marks)
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