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56=(3+11)*h/2
56=14*h/2
56=7h/7
h=8
2.
b=11cm
P=56cm²
P=(a+b)*h/2
P=(3+11)*h/2=14*h/2=7h
7h=56
h=8[cm]
2.c=7cm
h=4cm
P=50cm²
P=(a+b)*h/2
P=(a+b)*4/2
P=2(a+b)
2(a+b)=50
a+b=25
Ob=a+b+2c
Ob=25+2*7=25+14=39[cm]
a=3
b=11
P=56
P=1/2*(a+b)*h
h=P/ 1/2*(a+b)
h=56/ 1/2*(3+11)
h=56/1/2*14
h=56/7
h=8
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