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多选题Concerning the figure below, if a =b, which of the following statements must be true? (Indicate all such statements.)Ac=dBl and k are parallelCm and l are perpendicular

题目
多选题
Concerning the figure below, if a =b, which of the following statements must be true? (Indicate all such statements.)
A

c=d

B

l and k are parallel

C

m and l are perpendicular

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