Răspuns:
a) P=12,2m
b) P=24 cm
c) P=22,5 m
d) P=96 dm
Explicație pas cu pas:
a) AB=0,5 dam=5 m
BC=30 dm=3 m
AC=4,2 m
P=AB+BC+AC=5m+3m+4,2m=12,2 m
b) AB=4 cm
BC= 2*AB=2*4=8 cm
AC=BC+2=8+2=12 cm
P=24 cm
c) AB=10m
BC= AB/2=5 m
AC= 5 m+2500mm= 5m+ 2.5 m=7.5m
P=22,5 m
d) AB=36 dm
BC=7/9*AB=(7*36)/9=28 dm
AC=(AB+BC)/2=(36 dm+28 dm)/2=32 dm
P=96 dm