Arc

Key A.

An arc by its centre and two ends.
An arc by its centre and two ends.

How to draw it

Press Arc and choose the way in the bar above:

  • centre-start-end — the first click places the centre, the second the start, the third the end;
  • by 3 points — the start, the end and a point on the arc;
  • tangent — an arc continuing the end of a segment already drawn without a kink.

The arc once down opens its radius field: type a number and Enter — or keep drawing. Esc puts the tool down.

An arc holds by constraints

The tangency of an arc to the neighbouring segment is a constraint: move the segment and the arc stays tangent. The radius takes part in the solving, so equal radii and a point on the arc work as for a circle.

A rounded corner is easier with Corner fillet: a click on the corner, and the arc lies down with both tangencies and a dimension.

If it did not work

tangent draws nothing — there is nothing to continue: draw the segment the arc starts from first.

Point →