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Hi,
I need to construct a half cylinder (as a model), but I don't understand how to make the surface of the figure? It´s supposed to look like a gutter.
I have linked a picture down below, and I hope someone can help.
Files:
Screenshot 2020...
The same question 
Use the Surfacec Command as Surface( r*cos(t), r*sin(t), l, t, 0°, 180°, l, 0, h) with r as the radius and h as the given height of the cylinder. In brief: give the parametric formulas for x, y and z and define start and end values for radius and height
chris
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