Circle Command

From GeoGebra Manual
Revision as of 11:29, 3 July 2009 by Administrator (talk | contribs) (Protected "Manual:Circle Command": manual page ([edit=sysop] (indefinite) [move=sysop] (indefinite)))
Jump to: navigation, search

Circle[Point M, Number r]: Yields a circle with midpoint M and radius r.

Circle[Point M, Segment]: Yields a circle with midpoint M whose radius is equal to the length of the given segment.

Circle[Point M, Point A]: Yields a circle with midpoint M through point A.

Circle[Point A, Point B, Point C]: Yields a circle through the given points A, B and C.

Note: Also see tools Compass Tool, Circle with Center through Point Tool, Tools/Circle with Center and Radius Tool, and Circle through Three Points Tool



Use circles to fix the distance between two objects[edit]

Circles are a great way to make the distance between two objects constant: If there are two points A and B on two lines g (point A) and h (point B) where A can be moved and B should have the constant distance r to A you can define B as the intersection between the line h and the circle around A with the radius r. As a circle intersects a line at two points (in case it's not tangetial or passing by) you have to hide & ignore the second intersection.

An illustration of the described technique to fix the distance between two points A and B1
© 2022 International GeoGebra Institute