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Practice Questions
Try the question first, then reveal the solution only when you need it.
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Quick Q&A Before You Revise
How do I know when to use Pythagoras in this chapter?
Use Pythagoras whenever the radius to the point of contact, the tangent length, and the line joining the external point to the centre form a right triangle.
What is the most important side relation in a quadrilateral touching a circle?
If a quadrilateral circumscribes a circle, then the sum of one pair of opposite sides equals the sum of the other pair: AB + CD = BC + AD.
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