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'Weekly Problem 23 - 2008' printed from http://nrich.maths.org/

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$P$, $Q$ and $R$ are points on the circumference of a circle of radius 4cm. $\angle PQR=45^o$. What is the length of chord $PR$?
 

FIgure 1

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This problem is taken from the UKMT Mathematical Challenges.

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