периметр ABC = (AB+AD)+(BC+DC) -> AB+AD= 25 периметр ABD= AB+AD+BD -> BD= пер.ABD- (AB+AD) = 15
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периметр ABC = (AB+AD)+(BC+DC) -> AB+AD= 25
периметр ABD= AB+AD+BD -> BD= пер.ABD- (AB+AD) = 15