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33 votes
33 votes
Which coordinate plane shows that the shaded polygon in the image of the inside of polygon after 90° counterclockwise rotation about the origin?

Which coordinate plane shows that the shaded polygon in the image of the inside of-example-1
User SystemRaen
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3.0k points

1 Answer

26 votes
26 votes

Solution

When rotating a point 90 degrees counterclockwise about the origin our point A(x,y) becomes A'(-y,x). In other words, switch x and y and make y negative.


(x,y)-\longrightarrow(-y,x)

When we rotate a figure of 90 degrees counterclockwise, each point of the given figure has to be changed from (x, y) to (-y, x) and graph the rotated figure.

Which coordinate plane shows that the shaded polygon in the image of the inside of-example-1
User Knogobert
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3.0k points
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