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First, you have to find 3 points.

So for this I'll suggest first to select first the angle you want to check and than take the position of the near vertex(This will be your first point). You can give this point the value of(0,0) Origin of the coordinate.

Now you know that there is 2 lines go out from this point. find the coordinate of the most far pixel from this point By X and Y.

For example if I look for the top left corner (My origin) I search the most right pixel coordinate(Second point) and the most bottom pixel coordinate(Third point).

Now you have 3 point, So you can find the angle using [this topic].(http://www.teacherschoice.com.au/maths_library/trigonometry/triangle_given_3_points.htm)

Hope it solved your problem.

First, you have to find 3 points.

So for this I'll suggest first to select first the angle you want to check and than take the position of the near vertex(This will be your first point). You can give this point the value of(0,0) Origin of the coordinate.

Now you know that there is 2 lines go out from this point. find the coordinate of the most far pixel from this point By X and Y.

For example if I look for the top left corner (My origin) I search the most right pixel coordinate(Second point) and the most bottom pixel coordinate(Third point).

Now you have 3 point, So you can find the angle using [this topic].(http://www.teacherschoice.com.au/maths_library/trigonometry/triangle_given_3_points.htm)