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A parallelogram is a quadrilateral with opposite sides parallel (and therefore opposite angles equal
In mathematics, OPP typically stands for "Opposite." It is commonly used in trigonometry to refer to the side of a right triangle that is opposite to a given angle. The OPP side is the side that is directly across from the angle in question. Understanding the relationship between the OPP side and the other sides of a right triangle is crucial in solving trigonometric problems.
Lines opposite each other
We use it to mean "sides" but the original meaning was "angles."
Alternate Exterior Angles are created where a transversal crosses two (usually parallel) lines. Each pair of these angles are outside the parallel lines, and on opposite sides of the transversal.