Click where you want the arc to begin. In the dialog box, click a square on the reference point locator  to determine the point from which the arc is drawn. Then set any of the following options, and click OK.

Length X‑Axis

Specifies the width of the arc.

Length Y‑Axis

Specifies the height of the arc.

Type

Specifies whether you want the object to be an open path or a closed path.

Base Along

Specifies the direction of the arc. Choose X Axis or Y Axis depending on whether you want to draw the base of the arc along the horizontal (x) axis or vertical (y) axis.

Slope

Specifies the direction of the arc’s slope. Enter a negative value for a concave (inward) slope. Enter a positive value for a convex (outward) slope. A slope of 0 creates a straight line.

Fill Arc

Fills the arc with the current fill color.