Finds the desired angle (in degree)

1. Use this function to find the angle of two points measuring from East (3 o'clock) counterclockwise.

2. Use this function to find the angle of three points measuring from East ( 3 o'clock) counter clockwise.

3. Use this function to find the angle of four points measuring from East ( 3 o'clock) counter clockwise.

4. Use this function to find the angle of a line or straight edge measuring from East (3 o'clock) counterclockwise.

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