Notice that the angle measure is 90 and the direction is clockwise. When you rotate by 90 degrees, you take your original X and Y, swap them, and make Y negative. Therefore the Image A has been rotated 90 to form Image B. To write a rule for this rotation you would write: R270 (x, y) ( y, x). Thomas describes a rotation as point J moving from J( 2, 6) to J (6, 2). So from 0 degrees you take (x, y), swap them, and make y negative (-y, x) and then you have made a 90 degree rotation. Our point is at (-1, 2) so when we rotate it 90 degrees, it will be at (-2, -1) What if we rotate another 90 degrees? Same thing. The -90 degree rotation is the rotation of a figure or points at 90 degrees in a clockwise direction. What about 90 degrees again? Same thing! But remember that a negative and a negative gives a positive so when we swap X and Y, and make Y negative, Y actually becomes positive. Our point is as (-2, -1) so when we rotate it 90 degrees, it will be at (1, -2)Īnother 90 degrees will bring us back where we started. If you understand everything so far, then rotating by -90 degrees should be no issue for you. We do the same thing, except X becomes a negative instead of Y. If you have a point on (2, 1) and rotate it by 180 degrees, it will end up at (-2, -1) Videos, worksheets, stories and songs to help Grade 7 students learn about rotation in geometry. A rotation is a type of rigid transformation, which means it changes the position or orientation of an image without changing its size or shape. The following diagram gives some rules of rotation. A rotat ion does this by rotat ing an image a certain amount of degrees either clockwise or counterclockwise. Step 1: Note the given information (i.e., angle of rotation, direction, and the rule). For rotations of 90, 180, and 270 in either direction around the origin (0. The most common rotations are usually 90, 180 and 270. If necessary, plot and connect the given points on the coordinate plane. ![]() Step 2: Apply the 90-degree clockwise rule for each given point to. The clockwise rotation usually is indicated by the negative sign on magnitude. Note: A rotation that is 90-degrees clockwise will have the same result as a rotation that is 270 degrees counterclockwise. So the cooperative anticlockwise implies positive sign magnitude. Scroll down the page for more examples and solutions. ![]() A rotation (or turn) is a transformation that turns a line or a shape around a fixed point. This point is called the center of rotation. When you rotate by 180 degrees, you take your original x and y, and make them negative. So from 0 degrees you take (x, y) and make them negative (-x, -y) and then you've made a 180 degree rotation.
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