In the 3rd of March class we started using AutoCAD to create 2D and 3D surfaces.   To be possible to create a  Parabolic Revolution Surface  it´s mandatory to draw, at first, a parabola .   And what is a Parabola?   Is a curved line, without a rigorous determination, usually the result from a plannar section in a cone, where the section plan has to be paralell to the cone geratrix.   It is mainly composed by an axis, a guideline, a focus and a vertex.   To start the parabola, we drew a vertical line, starting at the point of x,y coordinates 50, 50  and ending ate the point 50, 200 . This vertical line will be the guideline  of the parabola.   Then, we drew another line, perpendicular  to the first one, from the point 50, 125  to the point 300, 125 . This one will be the axis  of the parabola.   On this second line, whit a distance of 50 units  from the guideline, we marked the focus  of the parabola.   And, between  the guideline and the focus point, we marked the vertex  of the future...
 
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