No, not necessarily. Think of a rhombus that is not a square. Its opposite angles are equal - either both acute (sum < 180) or both obtuse (sum >180).
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Opposite angles of a parallelogram are equal.
A parallelogram has 2 equal opposite acute angles and 2 equal opposite obtuse angles.
The opposite angles in a parallelogram are defined to be equal.
Opposite angles are equal
Yes, opposite angles in a parallelogram must be equal.