Note that the Compass tool costs 5 elementary (E) moves. — Euclidea Manual
Solutions
1L 5E Solution
- With the compass tool active, click on one endpoint of the segment, then another endpoint of the segment, then on the destination point.
Explanation
The compass tool works by selecting an initial radius (either click on the two points of the segment, or click-and-hold on one point of the segment and release on the second), followed by selecting a destination center with another click. The tool visualizes the size of the circle before it lands in its final location, then adds dashed line decorations indicating the two parallel and equivalent-length radii used between the original two points and the destination circle. Note that the decorations cannot be used as a target by other tools if they do not overlay an already-existing line. The two original points do not have to lie on a circle, and Euclidea does not allow the destination point to be either of the two source points (even if it did, using the Circle Tool would be a less expensive alternative). When copying an existing circle, it does not matter whether the first point is the center or on the circumference, as the selected radius will be the same either way for the destination center.