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Doubly ruled

In geometry, a surfaceS in 3-dimensional Euclidean space is ruled (also called a scroll) if through every point of S, there is a straight line that lies on S. Examples include the plane, the lateral surface of a cylinder or cone, a conical surface with ellipticaldirectrix, the right conoid, the helicoid, and the tangent developable of a smooth curve in space.

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