The figure below shows two triangles EFG and KLM.
Which step can be used to prove that triangle EFG is also a right triangle?
Answer
Prove that a + b is greater than c in triangle EFG so c2 = a2 + b2.
Prove that KL = EF so in triangle KLM c2 = a2 + b2 which makes triangle EFG a right triangle.
Prove that the sum of the squares of a and c in triangle EFG is greater than square of b in triangle KLM.
Prove that the sum of the squares of a and b in triangle KLM is greater than square of c in triangle EFG.

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i think it may be the first option but not sure

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