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'Weekly Problem 16 - 2011' printed from http://nrich.maths.org/

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The shorter sides of a right-angles isosceles triangle are each $10$cm long. The triangle is folded in half along its line of symmetry to form a smaller triangle. How much longer is the perimeter of the larger triangle than that of the smaller?
 
 
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This problem is taken from the UKMT Mathematical Challenges.

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