Geometry.1.B.9 - Unknown Angle Proofs - Writing Proofs – Exit Ticket

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1 question

In the diagram to the right, prove that the sum of the labeled angles is 180°.

From EngageNY.org of the New York State Education Department. Grade Geometry Mathematics Module 1, Topic B, Lesson 9. Internet. Available from https://www.engageny.org/resource/geometry-module-...; accessed 14/Apr/2016.