A carpenter would write 3' 9" or just 3' 9.
Other ways include 3 feet 9 , 3 3/4 feet , and 45 inches.
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0.75 foot 1 foot = 12 inches 9 inches: = 9 inches * 1 foot/12 inches = 9/12 or 3/4 = 0.75 foot
12 inches in a foot: 9 feet x (12 inches/foot) = 108 inches. 3/4 foot x (12 inches/foot) = 9 inches. 108 inches + 9 inches = 117 in
(9 foot) * (3 inches) * (1.5 inches) ≈ 7.9641131 liters (9 foot) * (3 inches) * (1.5 inches) ≈ 7,964.1131 cubic centimeters ≈ 7,964.1131 mL (9 foot) * (3 inches) * (1.5 inches) = 486 cubic inches = 486 in3 (9 foot) * (3 inches) * (1.5 inches) = 0.28125 cubic feet = 0.28125 ft3
9
9 inches is 3/4 of a foot.