![]() Is it better to go clockwise or counterclockwise? The rotation of a form by 90 degrees is the same as the rotation of a shape by 270 degrees counterclockwise.įigure out where the initial vertices were located in space.Ĭreate a formula for rotating a shape 90 degrees in a spreadsheet.įill in the blanks with the coordinates from the formula. Take note of the rotations in the clockwise and counterclockwise directions. It is possible to rotate a pre-image using this technique by taking the points of each vertex, translating them according to the rule, and then painting the picture.Īlso, are you familiar with how to rotate a graph? The following is the usual rule for rotating an item 90 degrees: (x, y) -–> -> (-y, x). If you wish to rotate in the clockwise direction, use the following formulas: The numbers 90 and 180 are (b and a) 270 and 360 are (-b and a) and 90 and 360 are (b and a) (a, b).Īlso, what is the rule for a rotation that is 90 degrees counterclockwise from the original direction? It should be noted that this is for a clockwise rotation. Because it is a complete rotation or a complete circle, the angle of 360 degrees does not vary. So, what are the formulae for rotations, just to be clear?ġ80 degrees is represented by (-a, -b), while 360 degrees is represented by (a, b). Rotating an item 90 degrees according to the general rule is as follows: ->-> (x,y) (-y, x). 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.There are several basic laws for the rotation of objects when utilising the most popular degree measurements, and they are listed below (90 degrees, 180 degrees, and 270 degrees). ![]() 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? Yes, it’s memorizing but if you need more options check out numbers 1 and 2 above!
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