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Pp. = 6*5 = 30 cm²
ogolny wzor na Pc graniastoslupow = 2Pp + 4Pb
wiec podstawiamy
280 = 2*30 + 4Pb
280= 60 + 4Pb
-4Pb = -220/:(-4)
Pb = 55cm²
czyli obliczamy jaka H ma graniastoslupo (w tym przypadku prostopadloscian)
55:30=1 ⁵₆
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