(1)有3个,分别是∠D,∠EMC,∠AMD.
(2)两对,AB∥DE,AC∥DF.
(3)∵△ABC沿BC方向平移2cm,
∴BE=CF=2cm.
又∵BC=4cm,
∴BF=6cm.
∴BE:BC:BF=1:2:3.
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