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b=6 cm
c=?
P=280 cm^2
P=2ab+2ac+2bc
280=2*5*6+2*5*c+2*6*c
280=60+10c+12c
22c=280-60
22c=220
c=220/22
c=10 cm
Spr.
P=2*5*6+2*5*10+2*6*10
P=60+100+120
P=280 cm^2
Odp.
Wysokość jest równa 10 cm.