The Interactive Geometry Software Cinderella
Forums> Cinderella Support (E)> rotations and reverse rotations
davidbak

rotations and reverse rotations


I'm trying to use the rotation Pang tool. I make an angle between two segments, and mark it, and the text for the angle reads ">fe = 48.1deg" for example. So now when I select the element and use the rotate button I get a 48.1deg rotation in the positive direction (counterclockwise) around the center of rotation. Now I'd like to get a rotation in the negative direction (clockwise). But I can't really see how.
1) No matter how I create an angle marking (that is, which segment of the angle I click first) I get a positive number in the angle text. 2) I can't figure out how to make a formula text that evaluates to the negative of the angle because the angle object (as seen in the construction view) is named alpha0 and I don't know how to type that as a formula.
So how is this done? Thanks! — Dave




