Because they are angles that are subtended by pairs of sides that are parallel to each other.
There are several ways of proving the angles are equal.
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Yes, the opposite interior angles of a parellelogram are equal.
Yes. A parallelogram is defined as having opposite sides that are parallel and equal in length, and opposite angles that are equal.
yes opposite angles are equal
A parallelogram with equal sides is a rhombus. If the interior angles are right angles, it's a square.
A parallelogram has 2 equal opposite acute angles and 2 equal opposite obtuse angles.