That this is equivalent to a positive 90 degree rotation. Get that point here, which we could have also gotten there by just rotating it by And then this would beĪnother negative 90, which would give you in total, negative 270 degrees. This would be rotatingĪnother negative 90, which would, together, be negative 180. The origin by negative, so this is the origin here, by negative 270 degrees, what would that be? Well let's see, this wouldīe rotating negative 90. If you were to start right over here and you were to rotate around So if I were to start, if I were to, let me draw some coordinate axes here. So let's just first thinkĪbout what a negative 270 degree rotation actually is. So actually let me go over here so I can actually draw on it. The points of this triangle around the origin by negative 270 degrees, where is it gonna put these points? And to help us think about that, I have copied and pasted
So what we want to do is think about, well look, if we rotate And this tool, I can put points in, or I could delete points.
So positive is counter-clockwise, which is a standard convention, and this is negative, so a negative degree would be clockwise. The direction of rotationīy a positive angle is counter-clockwise.
So this is the triangle PINĪnd we're gonna rotate it negative 270 degrees about the origin. We're told that triangle PIN is rotated negative 270ĭegrees about the origin.
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