P=9*12+9*20+12*20
P=108+180+240
P=428
B)P=9*3,5+9*4+3,5*4
P=31,5+36+14
P=81,5
a)
a=9cm
b=12cm
c=20cm
Pc=2Pp+Pb
Pc=2*a*b+2*a*c+2*b*c
Pc=2*9cm*12cm+2*9cm*20cm+2*12cm*20cm
Pc=216cm²+360cm²+480
Pc=1056cm²
B)
b=3,5cm
c=4cm
Pc=2*9cm*3,5cm+2*9cm*4cm+2*3,5cm*4cm
Pc=63cm²+72cm²+28
Pc=163cm²
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P=9*12+9*20+12*20
P=108+180+240
P=428
B)P=9*3,5+9*4+3,5*4
P=31,5+36+14
P=81,5
a)
a=9cm
b=12cm
c=20cm
Pc=2Pp+Pb
Pc=2*a*b+2*a*c+2*b*c
Pc=2*9cm*12cm+2*9cm*20cm+2*12cm*20cm
Pc=216cm²+360cm²+480
Pc=1056cm²
B)
a=9cm
b=3,5cm
c=4cm
Pc=2Pp+Pb
Pc=2*a*b+2*a*c+2*b*c
Pc=2*9cm*3,5cm+2*9cm*4cm+2*3,5cm*4cm
Pc=63cm²+72cm²+28
Pc=163cm²