Calculate the Radius of an Arc
Enter the width and height, then press "calculate" to get the radius.
It works for arcs that are up to a semicircle, so the height you enter must be less than half the width.
To draw the arc:
Note: * The radius can become quite long and a compass no longer would work. In this case, just use a piece of string to swing the arcs.
- Swing arcs (using the calculated radius) below the width using as center the endpoints of the width thus creating the intersection point of the arcs.
- Set the point of the compass* at this intersection point (which now becomes the centerpoint of the arc) and swing an arc thru the endpoints of the width thus creating the arc.