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OpenStudy (mackenzic):
will medal ΔABC has undergone a 90° counter-clockwise rotation. m∠ABC = 85°, m∠BCA = 55° What is the measure of ∠B'C'A'? 85° 55° 40° 35°
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Vocaloid (vocaloid):
hint: after a rotation, the angles don't change so ∠B'C'A' has the same measure, as <BCA
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