i hope that this answers all parallelogram questions: a parallelogram is a quadrilateral with angles that add up to 360 degrees. It has 2 parallel pairs of sides, so 4 sides. There may or ma not be lines of symmetry in a parallelogram. Some examples are squares, rhombuses, rectangles, etc.
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Add up the 4 sides together
explementary angles add up to 360 degrees supplementary angles add up to 180 degrees complementary angles add up to 90 degrees
The interior angles of a triangle add up to 180o. The interior angles of a square add up to 360o. Other shapes have other angles.
Exterior angles add up to 360 degrees Interior angles add up to 1080 degrees
Complementary angles add up to 90 degrees and supplementary angles add up to 180 degrees