Kalkulesen bilong eria bilong wanpela hap graun we i no stret
Plis soim ol sais long mita
A B,
B C,
C D,
D A - mak bilong ol sait bilong hap graun
U - rait angul ples
Olsem risal bilong kalkulesen, program bai painimaut eria bilong sait, ol angle we yumi no save long en na ol sais bilong diagonal.