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Pb= Pi*r*l
Pp=Pi*r^2
Pc= 25pi+75pi=100pi
2)
a)4pir^2= 4pi*0,65^2= 1,69pi. m^2
c) 4pir^2=4pi*0,64^2=0,4096=1,6384pi m^2
d)4pir^2=4pi*1,2^2=5,76pi. m^2