Try question 1
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 and explanation
Answer: A. P and Q
6 : 8 : 10 = 3 : 4 : 5, so P and Q are similar; 5 : 12 : 13 is a different ratio.
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Try question 2
R = {(a, b) : a = b − 3, b > 5} on N. Which pair belongs to R?
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Answer and explanation
Answer: B. (4, 7)
For (4, 7): 7 > 5 and 4 = 7 − 3. (2, 5) fails b > 5; the others fail a = b − 3.
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