У вашего броузера проблема в совместимости с HTML5
Rotating a polygon around the origin. Visit https://maisonetmath.com/transformations/quizzes/345-rotating-around-the-origin-90-and-180-degrees for more transformations practice.
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Test your knowledge of transformations by visiting https://maisonetmath.com/transformations/quizzes/345-rotating-around-the-origin-90-and-180-degrees and take online transformation quizzes.