Question

You’re given two side lengths of 3 centimeters and 5 centimeters. Which measurement can you use for the length of the third side to construct a valid triangle?

Answer 1

If it's a right triangle, use the rule 3-4-5. A^2 + B^2 = C^2.
3 x 3 = 9
5 x 5 = 25
25 - 9 = 16
Sq. Rt. of 16 is 4.