Question
$\int\limits_{2}^{2} \mid\text{x}\mid\text{dx}=$
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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
$\text{b}\ \forall\ \text{a},\ \text{b}\in\text{T}.$ Then, R is: