Circle Command

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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).


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.

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.

An illustration of the described technique to fix the distance between two points A and B1
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