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a)
pole szescianu = 6a²
6*7*7=294 cm²
b) a=2,5dm = 25cm
25*25*6=3750 cm²
2.
pole powierzchnie prostopadłościanu = ab+ac+bc
a) 5x10x7
5x10 + 5x7 + 10x7= 50 +35+70=155