The Construct menu

Here are the options in the construct menu. To use them, click the selection tool, then select an object (point, line segment, whatever). Then go to the Construct menu and choose which action you want to perform.

• Point on [Object] -- This places a point on the object you've selected. For example, if you've selected a line segment, this option will place a point somewhere on the segment.

• Midpoint -- Places a point at the midpoint of a line segment

• Intersection -- If you've selected two lines, or two line segments, or whatever, this constructs a point at the intersection of the lines.

• Segment -- If you've selected two points, this option constructs the line segment between them.

• Ray -- If you've selected two points, this constructs the ray starting at the first point you selected and passing through the second point.

• Line -- Constructs the line passing through two selected points.

• Parallel Line -- If you've selected a line and a point, this constructs a line passing through the point and parallel to the line.

• Perpendicular Line -- Select a point and a line. Then this option constructs a line perpendicular to the original line and passing through the point.

• Angle Bisector -- Select three points that determine an angle. Then this option constructs the ray that bisects the angle.

• Circle by Center+Point -- Select two points. This option constructs a circle centered at the first point and passing through the second.

• Circle by Center+Radius -- Select a point and a line segment (they don't necessarily need to be touching). This option constructs a circle centered at the point with a radius of the same length as the line segment.

• Arc on Circle -- Select a circle and two points on the circle. Then this constructs the arc connecting the two points along the circle.

• Arc through 3 points -- Select three points. Then this option constructs the arc through those points.

• [Object] Interior -- Select a shape (like a circle or triangle). This option constructs the interior of the shape.