Kalkulesen bilong wanpela 'arch' bilong wanpela 'picket fence'
Plis soim ol mak yu laikim long milimita
H - minimam hait bilong banis
Y - mak bilong banis
X - longwe namel long namel bilong ol ausait 'slat'
Z - bikpela bilong piket rel
K - Namba bilong ol 'slat' insait long wanpela hap
D - Distens namel long ol 'slat'
Sapos hait
Y > H
Sapos hait
Y < H