Linear
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Creates a rib that extends the sketch contours normal to the direction of the sketch until they meet a boundary.
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Natural
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Creates a rib that extends the sketch contours, continuing with the same contour equation until the rib meets a boundary. For example, if the sketch is an arc of a circle, Natural extends the rib using the circle equation, until it meets a boundary.
In this example, the rib extends from the arc contour, using the circle equation until it meets a boundary, forming a circle. The other end of the sketch extends using a straight line equation, until it meets a boundary.

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