81 inches is 6 feet and 9 inches. That is the approximate height of an average house door
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81 inches / 12 inches/foot = 6 feet 9 inches
6 FEET 9 inches
1 feet = 12 inches 81 inches = 6.75 feet.
81 inches. Every foot has 12 inches. 6x12 = 72. 72+9 = 81.
6 3/4