Reverse Pythagorean theorem

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

Δ ABC: 73 m, 66 m, 51 m
Δ DEF: 63 cm, 105 cm, 84 cm
Δ GHI: 50 dm, 48 dm, 14 dm
Δ JKL: 31 m, 45 m, 40 m
Δ MNO: 28 m, 53 m, 45 m




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