A point has coordinates; an angle does not.
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To find the complementary angle, you subtract 90 by the first given complement angle. To find the supplementary angle, you subtract 180 by the first given supplement angle.
Slope is the tangent of the angle between a given straight line and the x-axis of a system of Cartesian coordinates.
two-thirds of an angle is 30degree more than its supplemant. find the angle
It is simply the difference between their y coordinates.
The angle is 120°. Its supplement is 60°.