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a=8 cm Pc=?
b=12 cm
Pc= Pp+Pb
Pp= a^
Pp= 64 cm2
Pb= 4*\frac{1}{2}*a*h
b^= a^+h^
h^= b^-a^
h^= 144-64
h^= 80/√
h= √80
h= 4√5 cm
Pb= 2*8*4√5
Pb= 64√5cm2
Pc= (64+64√5)cm2