The nominal angle through which the step motor shaft rotates between adjacent step positions.
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I don't believe the response time of a stepper motor depends on the step angle.
The answer depends on how you number the steps: there is no universally agreed system.
OK, got it! What's the next step ?
If you are trying to find the missing angle of a triangle you do 180 degrees minus your two other angles. However if you are trying to find the missing angle of a quadrilaterals you do the same thing but with 360 degrees.
Assuming you've got a 180o protractor (and not a 360o angle measurer).To measure an acute, right or obtuse angle (ie 0o to 180o):Place the centre mark of the protractor on the centre of the angle (ie where the arms of the angle meet)Put one of the base lines (which will be marked 0o and 180o) on one of the arms of the angle, so that the other line of the angle is within the scale of the protractor.Use the scale which starts with 0o on the first arm to read off the angle to the other arm.To measure a reflex angle (ie 180o to 360o):Place the protractor centre as abovePut the base line as aboveUse the scale which starts with 180o on the first arm to read off the angle to the other arm.Add 180o to the angle found in step 3.