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'Weekly Problem 51 - 2010' printed from http://nrich.maths.org/

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The diagram shows a triangle and three circles whose centres are at the vertices of the triangle. The area of the triangle is $80 cm^2$ and each of the circles has radius $2cm$. What is the area, in $cm^2$, of the shaded area?

 
 
 
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This problem is taken from the UKMT Mathematical Challenges.

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