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b=10cm
c=1,4dm=14cm
pole=2ab+2ac+2bc
pole=2×20×10+2×20×14+2×10×14=
pole=400+560+280=1240cm²
10 cm = 1 dm
1,4dm = 1,4 dm ;)
2 x 1,4 = 2,8 dm ²
2,8 dm ² x 1 dm = 2,8 dm ²
Pole jest równe 2,8 dm ² =