Finds the MIDpoint of 2 points (when they are not connected by a line)
You can not mirror the left circle to the right side since you can not get any reference point of mirror line directly.
Use this function you can get the MIDpoint of top 2 corners and the MIDpoint of bottom 2 corners to mirror the left circle to the right side.
There is no reference point for you to draw the large circle between two rentangle.
Use this function you can get the MIDpoint between two rentangle to draw the large circle directly.
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