R = {(T₁, T₂) : T₁ is similar to T₂} on triangles. Triangles P (sides 3, 4, 5), Q (6, 8, 10) and S (5, 12, 13): which pair is related?
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Answer: A. P and Q
6 : 8 : 10 = 3 : 4 : 5, so P and Q are similar; 5 : 12 : 13 is a different ratio.