Pc=2ab+2ac+2bc
c)
a=11 cm
b=9 cm
c=3 cm
P=2*11*9+2*11*3+2*9*3
P=198+66+54
P=318 cm²
d)
a=3 m
b=1 dm=0,1 m
c=2 m
P=2*3*0,1+2*3*2+2*0,1*2
P=0,6+12+0,4
P=13 m²
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Pc=2ab+2ac+2bc
c)
a=11 cm
b=9 cm
c=3 cm
P=2*11*9+2*11*3+2*9*3
P=198+66+54
P=318 cm²
d)
a=3 m
b=1 dm=0,1 m
c=2 m
P=2*3*0,1+2*3*2+2*0,1*2
P=0,6+12+0,4
P=13 m²
2.1dm=0,1m
Pc=2*(0,1*3)+2*(2*3)+2*(0,1*2)=0,6+12+0,4=13m²