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→ Opposite sides of a parallelogram are congruent. Opposite angles of a parallelogram are congruent. Consecutive angles in a parallelogram are supplementary.
→ We know that consecutive interior angles of a parallelogram are supplementary. Thus, two consecutive angles are (30 + 60)° , (2 × 30 + 30)° i.e. 90° and 90°. Hence , the special name of the given parallelogram is ractangle.