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A parallelogram has opposite sides equal in length and parallel. A trapezoid has at least 1 pair of parallel sides. EXAMPLE Classify a Quadrilateral 1 Classify the quadrilateral in as many ways as possible.It can be classified as a parallelogram, rectangle, square, and rhombus. 10-8 Quadrilaterals 0410-0413_CH10L8-105711.indd 410 7/20/09 11:41:30 AM.
1 A parallelogram has rotational symmetry of order 2 (through 180Â°). 2  If it also has two lines of reflectional symmetry then it must be a rhombus or an oblong. 3  The perimeter of a parallelogram is 2(a + b) where a and b are the lengths of adjacent sides.