Help 100 points

Write "yes" for sides that form right triangles and "no" for sides that
do not form right triangles. Prove that each answer is correct.
1. 7, 24, 25
2. 30, 40, 45
3. 21.6, 28.8, 36
4. 10, 15, 18
5. 10.5, 36,50
6. 2.5, 6, 6.5