A parallelogram always has opposite sides of equal length.
Its 4 angles may be right angles, but in most parallelograms they're not.
If they are, then that parallelogram is also called a 'rectangle'.
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yes opposite angles are equal
A parallelogram has 2 equal opposite acute angles and 2 equal opposite obtuse angles.
Yes, the opposite angles in a regular quadrilateral are equal.
Yes, opposite angles in a parallelogram must be equal.
Opposite angles of a parallelogram are equal.