Reverse Pythagorean theorem

Given are lengths of the sides of the triangles. Decide which one is rectangular:

Δ ABC: 77 dm, 85 dm, 36 dm
Δ DEF: 55 dm, 82 dm, 61 dm
Δ GHI: 24 mm, 25 mm, 7 mm
Δ JKL: 32 dm, 51 dm, 82 dm
Δ MNO: 51 dm, 45 dm, 24 dm




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