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Mathematics 19 Online
OpenStudy (anonymous):

Help please! Will medal and fan! Angle ABC is formed by segments AB and BC on the coordinate grid: Angle ABC is rotated 90 degrees counterclockwise about the origin to form angle A’B’C’. Which statement shows the measure of angle A’B’C’? m∠A’B’C’ = 90 degrees m∠A’B’C’ = 180 degrees m∠A’B’C’ = m∠ABC m ∠A’B’C’ = 2 × m∠ABC

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