Geometry.1.B.11 - Unknown Angle Proofs - Proofs of Known Facts – Exit Ticket

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In the diagram to the right, prove that m∠d + m∠d − m∠a = 180°.

From EngageNY.org of the New York State Education Department. Grade Geometry Mathematics Module 1, Topic B, Lesson 11. Internet. Available from https://www.engageny.org/resource/geometry-module-... accessed 14/Apr/2016.