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A rhombus has at least two lines of symmetry. ----------- Attention: If a rhombus is a square, then you have 4 lines of symmetry. sahsjing Â· 6 years ago. Thumbs up.
A parallelogram has rotational symmetry of order 2 (through 180Â°) (or order 4 if a square). If it also has exactly two lines of reflectional symmetry then it must be a rhombus or an oblong (a non-square rectangle). If it has four lines of reflectional symmetry, it is a square. The perimeter of a parallelogram is 2(a + b) where a and b are the lengths of adjacent sides.