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P= 0,5*(a+b)*h
56= 0,5*(3+11)*h
56= 7*h
56:7= h
8= h
p=(3+11)*h/2=56cm2
p=14*h/2=56cm2
56*2=112
14*h=112
112/14=8
p=14*8/2=56cm2
H= 8cm