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Rules for Creating an Ellipse
An ellipse has the following properties:
The center point of an ellipse behaves the same as the center of a circle, and can be referred to by dimensions and constraints.
The axes of an ellipse are parallel to the horizontal and vertical axes of the sketch. An ellipse cannot be slanted.
Ellipse is defined by two radii: x-radius and y-radius. The length of the horizontal axis from the center of the ellipse to the ellipse itself is called the x-radius in Sketcher. The vertical half-axis is called the y-Radius. These radii can be dimensioned and can be referred to by Equal Radius constraints.
The center of the ellipse and the ellipse itself will snap to constraints while the ellipse is being sketched. Some of the constraints that can be applied to an ellipse are Tangency, Point on Entity, and Equal Radii.
If you want to slant it you have choose a slanted horizontal or vertical reference plane prior to starting the section. The only other work around is to use 4 conic arcs. Set all the endpoints tangent and rho equal to (sqrt(2)-1).
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