The figure below shows triangle nrm with r2 = m2 + n2: triangle nrm has legs m and n, and r is the length of its longest side. ben constructed a right triangle efd with legs m and n, as shown below: triangle efd has legs m and n and hypotenuse f. he made the following table to prove that triangle nrm is a right triangle: statement reason 1. r2 = m2 + n2 given 2. f2 = m2 + n2 pythagorean theorem 3. f2 = r2 substitution 4. f = r square root property of equality 5. triangle nrm is congruent to triangle efd ? 6. angle nrm is a right angle cpctc 7. triangle nrm is a right triangle angle nrm is a right angle which reason best fits statement 5? sss postulate sas postulate aaa postulate aas postulate