Yes, the parallelogram objects have Order 2 rotational of symmetry. Parallelogram, is a type of quadrilateral having four sides, its opposite sides are equal and parallel to each other. A parallelogram provides a same view after its rotation.
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For best results for teeth whitening, always check the expiration date on the box in which the Crest Whitestrips are stored. If the strips have expired before they are used, the active ingredient that whitens the teeth is no longer active and is not effective for the strips' intended use. The Crest Whitestrips should be used according to the directions on the package.