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If the lengths of two sides of a triangle measure 8 and 13, the length of the third side could measure:

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Answer:

Step-by-step explanation:

Suppose you lay the 8 inch and the 13 inch sides in a straight line on the floor, with the beginning of one touching the end of the other.  The total length of this straight-line arrangement would be (8 + 13) inches, or 21 inches.  In order for us to have a triangle, the 3rd side would have to be shorter than 21 inches.

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