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Mathematics
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Two sides of a triangle have lengths 7 and 11. Which inequalities represent the possible lengths for the third side, x?
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Which sides are they? a and b? b and c? or a and c?
The third side of a triangle must be greater than the difference of the other 2 sides. So side 3 must be > (11-7) or 4. The third side of a triangle cannot be greater than the sum of the other 2 sides. Side 3 must be < (11 + 7) or 18. Therefore: 4 < Side 3 < 18
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