Hektaro, simbolal abreviuro ha, esas mezur-unajo por surfaci qua ne apartenas al Internaciona Sistemo di Unaji. Ol equivalas 10 mil metri quadrata (10 000 m²). Esas 100 hektari po 1 quadrata kilometro. Un acre (anciena mezur-unajo di Britaniana imperio qua duras uzesar en Usa) equivalas cirkume 0,405 hektaro, ed 1 hektaro equivalas cirkume 2,47 acre.
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