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False. One foot must be in contact with the surface at every time.
No, one foot, is a length or whatever, and one square foot is a square where each side is one foot
A degree is a unit of measuring angles. A 3° angle is a small angle. A full circle has 360°, and a right angle has 90°, so 3° is 1/120th of a full circle, or 1/30th of a right angle. This is hard to visualize, so think of this. The sine of 3° is approx 0.05, so in a right triangle for every foot of hypotenuse, there is a rise of 0.05 feet. To visualize the angle, take a 10 foot board, put one end on the ground, and raise the other end 0.5 foot (6 inches) off the ground, and the board will make almost a 3° angle with the ground.
one feet is one foot. Feet is the plural form of foot. One foot is 12 inches.
One cubic foot, the volume of a cube that is one foot long, one foot high and one foot wide.