It is the angle that can be changed
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In mechanical design, a coumpound angle is the resultant of two individual angles that are perpendicular to each other.
The spanner is bent at an angle so that it can easily applied or hold the grip of any 6 sides of nut to achieve the maximum mechanical advantage by moving the handle to and fro in the shortest possible space.
MA = 5 / 0.75 = 6.67 Essentially, its the reciprocal of the sin of the ramp angle
( Assuming mass of object on incline plane is in kilograms (kg) ) . Force pulling down incline on object (kilogram force) = object mass * sin (incline angle) . Force of object acting on and normal to incline (kilogram force) = object mass * cos (incline angle) . Mechanical Advantage = 1 / ( sin ( incline angle ) )