а) P = 2(4+6) = 20(см)
S = 4•6 = 24(см²)
б)S = 3•4 = 12(см²)
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а) P = 2(4+6) = 20(см)
S = 4•6 = 24(см²)
б)S = 3•4 = 12(см²)