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It seems that we have a triangle whose length sides are 21 cm and 5 cm. So that the third side would have a length which can be smaller than 21 + 5 = 26 cm, and bigger than 21 - 5 = 19 cm (19 cm < PR < 26 cm).

Thus, all the numbers between 19 and 26 could be the length of the third side of the given triangle.

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Q: In a triangle whose 2 legs are 21 cm and 5 cm - what are the possible lengths for the third leg?
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