- What is the difference between a true tangent point and an apparent tangent point?
- How many lines are contained in the intersection of a tangent plane and the cone or cylinder with which it is tangent?
- How many points are contained in the intersection of a tangent plane and the cone or cylinder with which it is tangent?
- What is the purpose of an edge view (EV) cutting plane when solving for a line tangent to a sphere at a given point on the sphere?
- Why is the first step when solving for a plane tangent to a cylinder through a point outside the surface of the cylinder to draw a line through the point and parallel to the center line of the cylinder?
- How many solutions are there for a plane tangent to a cylinder through a point outside the surface of the cylinder? Of a cone? Of a sphere?
- Some television screens are called vertically flat. That is, a straight edge held vertically against the screen would be coincident with a vertical element of the screen, but if held horizontal to the screen would be tangent at a single point. Is this type of television screen a single-curved surface or a double-curved surface?
- Can two non-coincident planes be tangent to the same point on a cylinder? On a cone? On a sphere?
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