If you mean 3/4 of a turn then it is 270 degrees
3*pi/2 radians (or 270 degrees)
90 degrees
180 degrees
180 degrees
180
If you mean 1/4 of a turn then it is 90 degrees
As an angle 3/4 of a turn is 270 degrees
A 1/4 of a turn in geometry is 90 degrees
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They are not the same. A foot pound is a measurement of how hard it is to turn an item. A degree is a measurement of how far it is turned.
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If you mean 3/4 then 3/4 of 360 degrees is a turn of 270 degrees