Ile dm² szkła potrzeba na wykoniania akwarium o wymiarach 40cmx50cmx30cm ?
40cm * 50 cm = 200cm2 200 cm2 *2 = 400cm2 40cm*30cm= 120cm2 *2 = 240cm2
Pp= 30cm *50cm = 150cm2 400cm2+240cm2+150cm2=790cm2 szkla
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40cm * 50 cm = 200cm2 200 cm2 *2 = 400cm2 40cm*30cm= 120cm2 *2 = 240cm2
Pp= 30cm *50cm = 150cm2 400cm2+240cm2+150cm2=790cm2 szkla