Difference between revisions of "Circle Command"
From GeoGebra Manual
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;Circle( <Point>, <Point>, <Direction> ) | ;Circle( <Point>, <Point>, <Direction> ) | ||
:Creates a circle with center, through a point, and axis parallel to direction. | :Creates a circle with center, through a point, and axis parallel to direction. | ||
| + | {{Note|1=Don't use eg <code>x=0</code> or <code>y=0</code> for the Direction as it is ambiguous whether those are planes or lines}} | ||
Revision as of 08:43, 9 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.
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: Don't use eg
x=0 or y=0 for the Direction as it is ambiguous whether those are planes or linesComments
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.
