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b=5cm
P=2*a*b+2*a*c+2*b*c
P=280
P=2*6*5+2*6*c+2*5*c
P=60+12*c+10*c
P=60+22*c
280=60+22*c
22*c=220
c=10cm
a-5
b-6
Ppc=2Pp+Ppb
2Pp=2*6*5
2Pp=60
280-60=220
220=Ppb
Ppb=a*h*4 |/4a
Ppb/4a=h
220/20=11
h=11