But points, lines, and shapes can be rotates by any point (not just the origin)! When that happens, we need to use our protractor and/or knowledge of rotations to help us find the answer. The rotation rules above only apply to those being rotated about the origin (the point (0,0)) on the coordinate plane. If we compare our coordinate point for triangle ABC before and after the rotation we can see a pattern, check it out below: To derive our rotation rules, we can take a look at our first example, when we rotated triangle ABC 90º counterclockwise about the origin. Rotation Rules: Where did these rules come from? When we say we are rotating an object 90. Yes, it’s memorizing but if you need more options check out numbers 1 and 2 above! When rotating an object around a center point, we typically see 90, 180, and 270 degree rotations, although rotations can occur at any number of degrees. Know the rotation rules mapped out below.Use a protractor and measure out the needed rotation.We can visualize the rotation or use tracing paper to map it out and rotate by hand. There are a couple of ways to do this take a look at our choices below: When we rotate clockwise or When we rotate clockwise or counterclockwise, the two rotations should always add up to degrees. Let’s take a look at the difference in rotation types below and notice the different directions each rotation goes: How do we rotate a shape? Rotations are a type of transformation in geometry where we take a point, line, or shape and rotate it clockwise or counterclockwise, usually by 90º,180º, 270º, -90º, -180º, or -270º.Ī positive degree rotation runs counter clockwise and a negative degree rotation runs clockwise.
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