Draw an ellipse

This section describes how to draw ellipses. The figure illustrates the geometric points used to create an ellipse:

1. Major radius

2. Vertex

3. Angle between X-axis and major axis of ellipse

4. Minor radius

5. Major axis

6. Center of ellipse

7. Minor axis

There are three methods for drawing an ellipse:

• To create an ellipse using two vertices and a peripheral point,

With this method, you need to define two opposite vertices of the ellipse and a point on the periphery of the ellipse.

1. Click Geometry and then, in the Draw group, click the arrow next to Spline.

2. Click Axis & Point in the Ellipse section. The Ellipse 2 Vert Pnt dialog box opens.

3. Click a point to define a vertex of the ellipse.

4. Click the point at the opposite vertex of the ellipse.

5. Click a point on the periphery of the ellipse.

6. Continue creating ellipses with this method, or click to complete the operation.

• Create an ellipse using the center, an angle, and two radii

With this method, you need to define the following:

◦ Center of the ellipse

◦ Angle between the x-axis and the major axis of the ellipse

◦ Minor radius of the ellipse

◦ Major radius of the ellipse

1. Click Geometry and then, in the Draw group, click the arrow next to Spline.

2. Click Center, Angle & Radius in the Ellipse section. The Ctr Ang R dialog box opens.

3. Click a point to define the center of the ellipse.

4. Type the angle value between the X-axis and the major axis of the ellipse in the user input line and press the Enter key.

5. Type the major radius of the ellipse and press the Enter key.

6. Type the value for the minor radius of the ellipse and press the Enter key.

7. Continue creating ellipses with this method, or click to complete the operation.

• Create an ellipse using the center and two peripheral points

With this method, you need to define the center of the ellipse and two points on the periphery of the ellipse.

1. Click Geometry and then, in the Draw group, click the arrow next to Spline.

2. Click Center & 2 Points in the Ellipse section. The Ellipse Ctr Pnts dialog box opens.

3. Click a point where you want the center of the ellipse.

4. Click a point on the periphery of the ellipse.

5. Click a second point on the periphery of the ellipse.

6. Continue creating ellipses with this method, or click to complete the operation.