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P=2(ab+bc+ac)
a) 6cm x 5cm x 8cm
P=2(6*5+5*8+6*8)=2(30+40+48)=2*118=236 [cm^2]
b) 6,5dm x 4 dm x 10 dm
P=2(6,5*4+4*10+6,5*10)=2(26+40+65)=2*131=262[dm^2]
c) 2 dm x 5,8 cm x 45 mm= 20cm x 5,8cm x 4,5cm
P=2(20*5,8+5,8*4,5+20*4,5)=2(116+26,1+90)=2*232,1=464,2 [cm^2]
a)
a= 6cm
b= 5cm
c= 8cm
Pc= 2*6*8 + 2*5*8 + 2*6*5= 96+80+60= 236cm2
b)
a= 6,5dm
b= 4dm
c= 10dm
Pc= 2*6,5*10 + 2*4*10 + 2*6,5*4= 130+80+52=262cm2
c)
a= 2 dm = 20cm
b= 5,8 cm
c= 45mm =4,5cm
Pc= 2*20*4,5 + 2*5,8*4,5 + 2*20*5,8= 180+52,2+232= 464,2cm2