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Two sides of an isosceles triangle are 20 and 30. What is the difference of the largest and the smallest possible perimeters?
The trick here is that we don't know which is the repeated side. Our possible triangles are therefore 20 + 20 + 30 = 70 or 30 + 30 + 20 = 80. The difference is therefore 80 – 70 or 10.
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