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'Weekly Problem 49 - 2006' printed from http://nrich.maths.org/

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This figure is made from a straight line 16 cm long and two quarter circles, one with its centre at the midpoint of the straight line. What is the area of the figure (in cm$^2$)?


Semicircle with piece missing
If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.  

This problem is taken from the UKMT Mathematical Challenges.

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