IM G Unit 1 Lesson 13
- Rotate ABCD 90 degrees clockwise around Q.
- Rotate ABCD 180 degrees around R.
- Rotate HJKLMN120 degrees clockwise around O.
- Rotate HJKLMN 60 degrees counterclockwise around P.
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.
What angle of rotation is needed to take ABC to DEF?
IM G Unit 1 Lesson 13 from IM Geometry by Illustrative Mathematics, https://im.kendallhunt.com/HS/students/2/1/13/index.html. Licensed under the Creative Commons Attribution 4.0 license, https://creativecommons.org/licenses/by/4.0/.