3P circle

[shelly]

:oops: Seems like a dumb question but how do I draw a circle from two exact points and an exact radius? Thank you for your help!

[hendie]

you only need two points to define a circle ~ the radius is immaterial if you have two points, provided they are both on the circumference

[CarLB]

Hendie! You must have meant 2 points "if on the bisector". You need 3 points on a circumference to define a unique circle.

To draw a circle given 2 points and a radius, draw 2 circles using the 2 points as the centers and the known radius. Where these 2 circles intersect will be the center of the unknown circle.

[csiarch]

Draw a line between the two points.

Offset the line a distance greater that the radius.

Draw a line from the MIDpoint of the line between the two points PERpendicular to the offset line.

Draw a circle with the exact radius you want with its CENter on one of the points.

Where the circle intersects the line you drew from the midpoint is the new center. MOve the circle you drew to that INTersection. Its circumference should pass through both points. :)