Question

How to: determine if the side lengths could form a triangle. use an inequality to prove your answer

Answer 1

We need to simply use the triangle inequality Theorem, This theorem state that the sum of the two side lengths of a triangle must always be greater than the third side.

Now let's check from the given lengths

16 + 21 = 37 and 37 is less than 39 which is the third side

Hence, it cannot form a triangle