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Show that the relation R defined in the set A of all polygons as `R = {(P _(1), P _(2)): P _(1) and P _(2)` have same number of sides}, is an equivalence relation. What is the set of all elements in A related to the right angle triangle T with sides 3,4 and 5 ?

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The correct Answer is:
The set of all triangles
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