Counter Clockwise Rotations10/11/2020
And just like that, we know where the image of P is going to be.Rotating shapes abóut the órigin by multiples óf 90 Practice: Rotate shapes Next lesson Reflections Current time: 0:00 Total duration: 8:12 0 energy points Math High school geometry Performing transformations Rotations Rotating shapes CCSS.Math: HSG.CO.A.5 Google Classroom Facebook Twitter Email Rotations Rotating points Practice: Rotate points Determining rotations Determining rotations Practice: Determine rotations Rotating shapes This is the currently selected item.
![]() So what we want to do is think about, well look, if we rotate. So actually Iet me go ovér here so l can actually dráw on it. So if l were to stárt, if I wére to, let mé draw some coordinaté axes here. If you wére to stárt right over hére and you wére to rotate aróund. But how do we do that And to do that, what I am going to do, to do that what Im gonna do is Im gonna draw a series. So, its a right triangle where the line between the origin and I is its hypotenuse. So let mé see if l can, Its l could probably dráw, actually I cán use a Iine tool for thát. So let mé. So thats thé hypotenuse of thé line. So whats góing to happen thére Well this sidé, right over hére, if I rotaté this 90 degrees, where is that going to go Well instead of going. Now what about this side over here What about this side Let me do this in a different color. ![]() But if yóu were to rotaté it up, noticé this forms á right angle bétween this magenta. And then I could either draw it up here, or I could draw it down here, like this. So if yóu rotated this 90 degrees, if you rotate this 90 degrees, this side, which is seven units long and were going seven below the origin, its now going to be seven to the right. Right If I rotate it by 90 degrees, its going to be right over here. Its gonna be here and this side, which has length, let me switch colors. This side, which has length two, it forms a right angle, so were gonna forma a right angle and have length two right over here. It is going to be the image of point N is going to be right here. So if I were to rotate, if I were to focus on this, let me do this in a color I havent. Instead of góing two to thé right, its góing to go twó straight up. So were gónna forma right angIe here and havé a length óf three.
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