If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Main content
Current time:0:00Total duration:1:17

Video transcript

we're asked to rotate the line-segment negative 90 degrees around the origin so this is our line segment we want to rotate it around the origin so let's use our rotate tool so let's define our point of rotation so we're going to rotate around the origin so that's why I put it there and I'm going to rotate it negative 90 degrees so I'm going to rotate it in this direction so let's see if I can pull this off so so negative so actually let me undo what I just did let me get my rotate tool back here so negative 90 degrees so these arrows right over here right now they're straddling the x-axis if I rotate negative 90 degrees these arrows this double-headed curvy arrow should straddle should exactly straddle the negative y-axis so let's do make sure I do that so the negative y-axis there we go so I have rotated this line segment negative 90 degrees about the origin and now we got to answer some questions when a line segment is rotated the image created is a well it's of course a line segment we know this is true because the rotated image has two endpoints the rotated image is the same length as the original image yet we haven't changed the length of this we just rotated it around this dot