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OpenStudy (anonymous):
ΔBCD is rotated 80° clockwise about the origin to form ΔKLM. If m∠KLM=30° , what is m∠BCD?
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OpenStudy (aum):
Triangles BCD and KLM are congruent (because rotation about the origin changes only the orientation of the triangle and does not change the length of the sides of the triangle or the angles of the triangle). Therefore, m<KLM = m<BCD
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