A triangle has two sides of lengths 7 and 9. What value could the length of the third side be?

asked May 18, 2015 114k views

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2 votes

x - length of the 3rd side

$7+9>x \wedge 7+x>9 \wedge 9+x>7\\ x<16 \wedge x>2 \wedge x>-2\\ x\in(2,16)$

Leo Bartkus answered May 23, 2015

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