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Derive a parametric representation of a ruled surface with two control lines (straight lines), one going...

Derive a parametric representation of a ruled surface with two control lines (straight lines), one going from (0,0) to (0,10); and the other going from (10,0) to (10,10). Is this surface planar or not? Justify by calculating the surface normal and showing that it is independent of position (planar surface) or dependent of position (non-planar surface).

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