
A A\,A and B B\,B are points on the circumference of a circle, centre OOO. AC AC\,AC is a tangent to the circle. OBC OBC\,OBC is a straight line.
OA=5 cmOA = 5\text{ cm}OA=5 cm AC=12 cmAC = 12\text{ cm}AC=12 cm
Find the length of BCBCBC.
You must show all your working.
59 exam-style questions on AQA GCSE Maths Circle Theorems. Each one has a worked solution and a mark scheme showing where the marks go.