BC= 1 dm= 10 cm
P= 2 ( AB+BC)
P= 2 (6 + 10)
P= 2 x 16 cm
P= 32 cm
b) AD= 3000 cm= 30 m
CD= 0,04 km= 40 m
P= 2( AD+ CD)
p= 2(30 + 40)
P= 2 x 70
P= 140 cm
c) AB= 12
12 cm= 80% din BC
80 BC/ 100= 12
80 BC= 1200
BC= 1200 / 80
BC= 15 cm
P= 2( AB+BC)
p= 2 (12 + 15)
P= 2 x 27
P= 54 cm