Draw a triangle on a graph with the one side starting at the orgin and going along the x axis a length "x". At the end of this line draw a verticle line going up"y" - this is the other side of the triangle.
Now finish the triangle with the hypotenuse "h"(from orgin to the top of the y line)
the angle from the x axis to the hypotenuse is theta.
the x axis line and the y axis line is a 90 degree
The remaining angle is (90-theta)
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