# Circle Command

From GeoGebra Manual

- 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, Circle with Center through Point, Circle with Center and Radius, and Circle through Three Points.

## Comments

## Tips[edit]

### 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.