Let T be the set of all triangles in the Euclidean plane, and let a relation R on T be defined as aRb if a is congruent to b a, b ∈ T. Then R is
(A) reflexive but not transitive
(B) transitive but not symmetric
(C) equivalence
(D) none of these
Answer is (C)
Given, aRb if a is congruent to b a, b ∈ T
