# Difference between revisions of "Circle Command"

From GeoGebra Manual

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({{Note|1=If you use eg <code>x = 0</code> or <code>y = 0</code> for the ''Direction'' it will be interpreted as a plane, not a line }}) |
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− | <noinclude>{{Manual Page | + | <noinclude>{{Manual Page|version=5.0}}</noinclude>{{command|conic}} |

− | ; Circle | + | ;Circle( <Point>, <Radius Number> ):Yields a circle with given center and radius. |

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

− | ; Circle | + | ;Circle( <Point>, <Point> ):Yields a circle with given center through a given point. |

− | ; Circle | + | ;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 [[File:Mode compasses.svg|link=|20px]] [[Compass Tool|Compass]], [[File:Mode circle2.svg|link=|20px]] [[Circle with Center through Point Tool|Circle with Center through Point]], [[File:Mode circlepointradius.svg|link=|20px]] [[Circle with Center and Radius Tool|Circle with Center and Radius]], and [[File:Mode circle3.svg|link=|20px]] [[Circle through 3 Points Tool|Circle through 3 Points]] tools.}} | |

+ | <br> | ||

+ | ;Circle( <Line>, <Point> ) | ||

+ | :Creates a circle with line as axis and through the point. | ||

+ | ;Circle( <Point>, <Radius>, <Direction> ) | ||

+ | :Creates a circle with center, radius, and axis parallel to direction, which can be a line, vector or plane. | ||

+ | :{{example| 1=<div><code><nowiki>Circle( <Point>, <Radius>, <Plane> )</nowiki></code> yields a circle parallel to the plane and with perpendicular vector of the plane as axis.</div>}} | ||

+ | ;Circle( <Point>, <Point>, <Direction> ) | ||

+ | :Creates a circle with center, through a point, and axis parallel to direction. | ||

+ | {{Note|1=If you use eg <code>x = 0</code> or <code>y = 0</code> for the ''Direction'' it will be interpreted as a plane, not a line }} |

## Latest revision as of 14:18, 10 July 2018

- 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 3 Points tools.

- Circle( <Line>, <Point> )
- Creates a circle with line as axis and through the point.
- Circle( <Point>, <Radius>, <Direction> )
- Creates a circle with center, radius, and axis parallel to direction, which can be a line, vector or plane.
**Example:**`Circle( <Point>, <Radius>, <Plane> )`

yields a circle parallel to the plane and with perpendicular vector of the plane as axis.

- Circle( <Point>, <Point>, <Direction> )
- Creates a circle with center, through a point, and axis parallel to direction.

**Note:**If you use eg

`x = 0`

or `y = 0`

for the *Direction*it will be interpreted as a plane, not a line

## 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.