IM G Unit 1 Lesson 20
Lines l and m are parallel. Mentally evaluate the measure in each figure.
- Translate lines AE and CD by the directed line segment from B to C. Label the images of A, B, C, D, E as A', B', C', D', E' .
Identify 3 pairs of congruent angles. How do you know they are congruent?
An Alternate Explanation
- Rotate line AE by 180 degrees around point C. Label the images of A, B, C, D, E as A', B', C', D', E' .
IM G Unit 1 Lesson 20 from IM Geometry by Illustrative Mathematics, https://im.kendallhunt.com/HS/students/2/1/20/index.html. Licensed under the Creative Commons Attribution 4.0 license, https://creativecommons.org/licenses/by/4.0/.
Identify 3 pairs of congruent angles. How do you know they are congruent?