the answer would be 180 degrease and if you don't believe me go on another website...
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You dont, its just 90 degrees 3 times..
rotate it 90 degrees
Yes
Switch the x and y coordinates and multiply the first first coordinate (the new x coordinate) by -1
To rotate a figure 180 degrees clockwise about the origin you need to take all of the coordinates of the figure and change the sign of the x-coordinates to the opposite sign(positive to negative or negative to positive). You then do the same with the y-coordinates and plot the resulting coordinates to get your rotated figure.