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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.
the answer would be 180 degrease and if you don't believe me go on another website...
180o is half a circle (semi-circle). To rotate do the following: 180 + 180 = 360o
A 1/2 rotation
Flip the graph over the x and y axes. one first, then the other. All coordinates will then be (-x, -y).