https://www.khanacademy.org/math/geometry/hs-geo-similarity/hs-geo-similarity-definitions/v/testing-similarity-through-transformations 2023-05-12T21:01:01.897246564Z Similar shapes & transformations Two shapes are similar if we can change one shape into the other using rigid transformations (like moving or rotating) and dilations (making it bigger or smaller). Other kinds of transformations can change the angles or the ratios of lengths in a figure. If we need those types of transformations, the shapes are not similar. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/95165e7e-8131-4ac8-a2d0-7ee788f53bf6_1280_720_base.png Similar shapes & transformations Two shapes are similar if we can change one shape into the other using rigid transformations (like moving or rotating) and dilations (making it bigger or smaller). Other kinds of transformations can change the angles or the ratios of lengths in a figure. If we need those types of transformations, the shapes are not similar. https://cdn.kastatic.org/ka-youtube-converted/H-YuW_uckz4.mp4/H-YuW_uckz4.mp4 158 Definitions of similarity https://www.khanacademy.org/math/geometry/hs-geo-similarity/hs-geo-similarity-definitions/e/exploring-angle-preserving-transformations-and-similarity 2026-03-09T04:30:46.094426574Z Similarity & transformations Given a pair of figures in the coordinate plane, determine whether they are similar based on whether it is possible to map one to the other using angle-preserving transformations. Tomer Gal exercise