2.) Side Lengths : 7cm, 11cm, 15cm

7.)Side Lengths : 9cm, 12cm, 15cm

I did it wrong so here are the right answers :

A: Yes it is a right triangle

B: No it is not a right triangle

C: Yes it is a right triangle

D: Yes it is a right triangle

E: Yes it is a right triangle

18.) I cant figure it out so maybe you could help me out and show me how to do it ? :)

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