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If a triangle has 2 sides of length 9 inches and 15 inches, then the length of the third side CANNOT be..?

 

A) 17    B) 15    C) 9     B) 8.7     D) 5

 Apr 30, 2022
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By triangle inequality, sum of any two sides must be greater than the other side.


If the third side is 5, then 9 + 5 < 15, which contradicts triangle inequality.

 

The answer is 5.

 May 2, 2022

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