# Difference between revisions of "Circle Command"

From GeoGebra Manual

(added tool images) |
|||

Line 4: | Line 4: | ||

;Circle[ <Point>, <Segment> ]:Yields a circle with given center and radius equal to the length of the given segment. | ;Circle[ <Point>, <Segment> ]:Yields a circle with given center and radius equal to the length of the given segment. | ||

;Circle[ <Point>, <Point> ]:Yields a circle with given center through a given point. | ;Circle[ <Point>, <Point> ]:Yields a circle with given center through a given point. | ||

− | ;Circle[ <Point>, <Point>, <Point> ]:Yields a circle through the three given points (if they do not lie on | + | ;Circle[ <Point>, <Point>, <Point> ]:Yields a circle through the three given points (if they do not lie on the same line). |

− | {{Note|1=See also [[Compass Tool|Compass]], | + | {{Note|1=See also [[Image:Tool_Compasses.gif]] [[Compass Tool|Compass]], [[Image:Tool_Circle_Center_Point.gif]] [[Circle with Center through Point Tool|Circle with Center through Point]], [[Image:Tool_Circle_Center_Radius.gif]] [[Circle with Center and Radius Tool|Circle with Center and Radius]], and [[Image:Tool_Circle_3Points.gif]] [[Circle through Three Points Tool|Circle through Three Points]] tools.}} |

{{betamanual|version=5.0|{{Note|1=From GeoGebra 5, this command will work in 3D with 3D points as well.}} | {{betamanual|version=5.0|{{Note|1=From GeoGebra 5, this command will work in 3D with 3D points as well.}} | ||

}} | }} |

## Revision as of 17:34, 13 June 2013

- Circle[ <Point>, <Radius Number> ]
- Yields a circle with given center and radius.
- Circle[ <Point>, <Segment> ]
- Yields a circle with given center and radius equal to the length of the given segment.
- Circle[ <Point>, <Point> ]
- Yields a circle with given center through a given point.
- Circle[ <Point>, <Point>, <Point> ]
- Yields a circle through the three given points (if they do not lie on the same line).

**Note:**See also Compass, Circle with Center through Point, Circle with Center and Radius, and Circle through Three Points tools.

Following text is about a feature that is supported only in GeoGebra 5.0.
Note: From GeoGebra 5, this command will work in 3D with 3D points as well. |

## 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.