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Mathematics 15 Online
OpenStudy (anonymous):

Three copies of a triangle were rotated and positioned as shown. Which statement about the figure is always true? A. Angle 2 and angle 3 form a right angle. B. Angle 1 and angle 3 form a straight angle. C. m∠1 = m∠2 D. The sum of m∠1, m∠2, and m∠3 is 180°. http://static.k12.com/calms_media/media/1560500_1561000/1560892/1/97202a8cba8d842585e08726b9a1a32626d3df4a/MS_IMC-1401112-109064.jpg

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