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r=1/3h
h=18cm
a/2=h
18=a/2*2
36=a:
36/=a
a=36/*/
a=12
P=a*h/2
P=12*18/2
P=108 cm2
Pk=πr2
Pk=π*6*6
Pk=36πcm2
Pfig. = 108 - 36π
Pfig = 36(3 - π)