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
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.
