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20 : 4 = 5 ( dł 1 krawędzi )
p . sz .= a2 ( kwadrat ) * 6
p. sz = 5^2( kwadrat) * 6
p. sz.= 25*6
p. sz =150
20cm:4=5 jedna krawędz
pole=6a^2
P=6*25=150 cm^2