Chèng-hong-hêng (pe̍h-ōe: chiàⁿ-hong-hêng, Hàn-jī: 正方形; Eng-gí: square), mā hō-chò sù-hong-chhioh (四方尺), sī ióng-iú 4 tiâu pêⁿ tn̂g ê pian kap 4 ê pêⁿ tōa ê lōe-kak ê to-pian-hêng.
