Two sides of a triangle measure 7 cm and 15 cm. which could be the measure of the third side of the triangle?

Does anyone know how to do geometryme with this problem

Statements reasons 1. ab ? cd; ad ? bc 1. given 2. ac ? ac 2. reflexive property 3. ? adc ? ? cba 3. ? 4. ? dac ? ? bca; ? acd ? ? cab 4. cpctc 5. ? dac and ? bca are alt. int. ? s; ? acd and ? cab are alt. int. ? s 5. definition of alternate interior angles 6. ab ? cd; ad ? bc 6. converse of the alternate interior angles theorem 7. abcd is a parallelogram 7. definition of parallelogram what is the missing reason in step 3?

D. in a discrete probability distribution, the sum of the probabilities for the discrete variables will be > 1. true or false