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6cm × 2 + 15cm × 2 = 12 + 30 = 42cm - obwód
6cm × 15cm = 90cm² - pole
15 : 2,5 = 6cm
obwód
ob=6 × 2 + 15× 2 = 12 + 30 = 42cm
pole
P=6 × 15 = 90cm²