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No. Opposite angles are equal. Adjacent angles are supplementary.
No. A rhombus is a parallelogram with all equal sides. A parallelogram with all equal angles is a rectangle (which might also be a rhombus and a square).
a parallelogram
A rhombus is a special case of a parallelogram, where all sides are equal length. A rhombus and a parallelogram have the opposite vertices are equal angles, but adjacent angles are not necessarily equal.
A parallelogram does not equal 180. A parallelogram is a plane figure bounded by two pairs of parallel lines. What does equal 180 is the sum of the measures of any pair of adjacent angles. The two adjacent angles have a side in common. If that line is considered as the intercept of the pair of parallel lines, it is easy to show that the angles should add to 180 degrees.