Ko te tikanga o te diagonal isometic isometric te kaiwhakamahara o te quadrilateral: Tuhia he papa tuuturu na te kaiwhakamahara o te {{0} ko te roa o te diagonal e rite ana ki te rahi o te diagonal. Mena kaore i te rite te roa, ko te tikanga ehara i te tapawhara, he taimana, he trapezoid ranei {{1 {1 {1 {2} {2} {2} {2} {2} {2} {2} {2} {2}
