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must be 10 because scalene means can't be same as any other side, so can't be 5 or 7. Check: is 10 less than 5 + 7? It needs to be or you can't make a triangle. And it is, so your scalene triangle has sides of 5, 7, and 10.

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Q: Two sides of a scalene trangle measure 5cm and 7cm Which of these measurements could the third side be 5cm 7cm or 10cm?
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