rotate it 90 degrees
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it will turn on a pivot point of the triangle.
You dont, its just 90 degrees 3 times..
stick your arms straight out in front of you. Pretend that's twelve o'clock then move one of your arms to three o'clock. Bring the other arm and turn your body to three o'clock. you have just moved 90 degrees clockwise.
Switch the x and y coordinates and multiply the first first coordinate (the new x coordinate) by -1
It has 180 degrees, but one angle of the triangle has to be 90 degrees