Flip the graph over the x and y axes. one first, then the other.
All coordinates will then be (-x, -y).
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I dont really know if this is right but i think to do this problem you have to take a point then rotate the paper counter clockwise around the origin then you have a new point which is called a prime. Then reflect it over the y axis on the graph.
18 degrees is 5% on a circle graph.
Figure it out your self
It is an angle of 162 degrees.
A segment that covers 1/5 of the circle. ie 72 degrees