Problem 4, August 2016 Geometry (Common Core) Regents Exam - JuanTutors.com

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In the diagram below, m∠BDC 100°, m∠A 50°, and computations.
m∠DBC 30°. Which statement is true?

(1) ABD is obtuse. (3) m∠ABD 80°
(2) ABC is isosceles. (4) ABD is scalene.
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