IM G Unit 1 Lesson 19 Cool Down

Give the [b]most convincing[/b] explanation you can for why [i]a=c[/i].
IM G Unit 1 Lesson 19 Cool Down from IM Geometry by Illustrative Mathematics, https://im.kendallhunt.com/HS/students/2/1/19/index.html. Licensed under the Creative Commons Attribution 4.0 license, [url=https://creativecommons.org/licenses/by/4.0/]https://creativecommons.org/licenses/by/4.0/[/url]. 
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