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im.g.1.13.3.translate, rotate, reflect (10)

1. Mai suspects triangle ABC is congruent to triangle DEF. She thinks these steps will work to show there is a rigid transformation from ABC to DEF. * Translate by directed line segment v. * Rotate the image __ degrees counterclockwise around point D. * Reflect that image over line DE. Draw each image and determine the angle of rotation needed for these steps to take ABC to DEF.
2. Mai's first 2 steps could be combined into a single rotation. Find the center and angle of this rotation. Verify your answer by using the rotation and final step to take ABC onto DEF.

3. Describe a general procedure for finding a center of rotation.


illustrative mathematicsgeometryunit 1 (constructions)lesson 13activity 3 Translate, rotate reflect Licensed under the Creative Commons Attribution 4.0 license,