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Mathematics 12 Online
OpenStudy (jokersmart):

Will medal Three copies of a triangle were rotated and positioned as shown. Which statement about the figure is always true? A. The sum of m∠1, m∠2, and m∠3 is 90°. B. m∠1 + m∠2 + m∠3 = 180° C. Angle 1 and angle 3 form a straight angle D. Angle 1, angle 2, and angle 3 all have the same measure.

OpenStudy (jokersmart):

OpenStudy (tabdo1226):

I think it's d

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