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Published byAshlyn Todd Modified over 8 years ago

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Rotations on the Coordinate Plane

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Horizontal- left and right

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Vertical- up and down

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A ROTATION of a geometric figure is the turn of the figure around a fixed point.

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Clockwise used sometimes

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Counter-clockwise used most of the time

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90 a quarter of a turn

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180 A straight angle

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5 4 3 2 1 -5-4-3-2 12345 -2 -3 -4 -5 Rotate the figure clockwise 90 around the origin. (The origin is the center.) A B C B C A

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5 4 3 2 1 -5-4-3-2 12345 -2 -3 -4 -5 A B C D D CB A Rotate the figure 90 counter-clockwise around the origin.

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5 4 3 2 1 -5-4-3-2 12345 -2 -3 -4 -5 A BC A B C Rotate the figure 180 counter- clockwise around the origin.

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5 4 3 2 1 -5-4-3-2 12345 -2 -3 -4 -5 Rotate the figure 180 clockwise around the origin. AB C D C B D A

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90˚ Rotation The general rule for a 90˚ rotation about the origin is: (X, Y) (Y, - X). Where you switch the x and y coordinates and multiply the y by -1.

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180˚ Rotation The general rule for a 180˚ rotation about the origin is: (X, Y) (-X, - Y). You multiply each coordinate by -1.

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270˚ Rotation AKA 90 ˚ Counterclockwise The general rule for a 270˚ rotation about the origin is: (X, Y) (-Y, X) Where you switch your x and y coordinate and multiply the x by -1.

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