Learn how to draw the image of a given shape under a given rotation about the origin by any multiple of 90°.

To see the angle of rotation, we draw lines from the center to the same point in the shape before and after the rotation. Counterclockwise rotations have positive angles, while clockwise …

While you got it backwards, positive is counterclockwise and negative is clockwise, there are rules for the basic 90 rotations given in the video, I assume they will be in rotations review.

Positive rotation angles mean we turn counterclockwise. Negative angles are clockwise. We can think of a 60 degree turn as 1/3 of a 180 degree turn. A 90 degree turn is 1/4 of the way …

You see that that is equivalent, that is equivalent to a 90 degrees, to a 90 degrees clockwise rotation, or a negative 90 degree rotation. And 90 degree rotations are a little bit easier to think …

Rotations that are positive (e.g. 90˚) go counterclockwise, while negative rotations (e.g. -54˚) go clockwise. When looking at a graph and measuring rotations, a center point is normally given.

Same way if you have to do a long division/multiplication problem and you have no calculator or paper. You have to estimate! To make it easier, imagine the origin (point of rotation) if it isn't …

Example: If you rotate the point (-4, 5) 90 degrees Clockwise about the origin, it becomes (5, 4). For 180 degrees rotation, it's just simple negate (turn opposite) both coordinates.

- [Host] We're told that Eduardo rotated triangle ABC by 90 degrees clockwise about the origin to create triangle A prime, B prime, C prime. So what Eduardo did is took this triangle right over …

Also, remember to rotate each point in the correct direction: either clockwise or counterclockwise. In this video, you are told that the point of rotation is the origin (0, 0), but the point of rotation …