Explicație pas cu pas:
67m=670 dm
2x670+2x338=1340+676=2016 dm
P=2016dm
182hm=18,2km
18,2 km-(2x6,3)=18,2-12,6=5,6
Iatimea=5,6:2=2,8 km
8,5m=8500 mm
2x8500+2x680=17000+1360=18360 mm
P=18360 mm
456 cm=4560 mm
4560 - (186x2)=4560-372=4188
Lungimea =4188: 2=2094mm
855m=8550 dm
2x8550+2x855=17100+1710=18810 dm
P=18810 dm
