Circle Command

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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 Tool, Circle with Center through Point Tool, Circle with Center and Radius Tool, and Circle through Three Points Tool



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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