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∵△ABC∽△A′B′C′,面積比為4:1,∴相似比為2:1,周長比為2:1.∵周長比相差1,而周長之差為20,∴每份周長為20,∴△ABC的周長是2×20=40,△A′B′C′的周長是1×20=20.
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