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Pc=2Pp+Pb
280=2(6*5)+2(6*H)+2(5*H)
280=60+12H+10H
220=22H
10=H
280=2×5×6+2×5h+2×6h
280=60+10h+12h /-60
220=22h /:22
h=10cm
pole podstawy
P=6cm*5cm
P=30cm2
pole powierzchni bocznej
Pb=2*5cm*h+2*6cm*h
Pc=2*30cm2 +2*5cm*h +2*6cm*h
280cm2=60cm2+10h+12h
220=10h+12h
22h=220
h=10cm
odp:wysokość prostopadłościanu ma 10cm