Ukubalwa kwendawo yendawo engakajayeleki
Sibawa utjengise ubukhulu ngamamitha
A B,
B C,
C D,
D A - ubukhulu bamahlangothi weplothi
U - indawo ye-engeli elungileko
Njengomphumela wokubala, ihlelo lizokunquma indawo yendawo, ama-engeli angaziwako kanye nobukhulu be-diagonal.