Measure an angle!
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60'
By using trigonometry
Into minutes, then seconds. A 1 degree angle is 60", 0' or, a 1 degree angle can be expressed as 0", 3600' a .5 degree angle can be expressed as 30", and so on.
The angle of reference is in the first quadrant, and 90 degrees angle is not in the quadrant.
plane trigonometry spherical trigonometry