radial surfaces Author: Andalucía 2009-June PAU
Course: 2 Bachillerato
Level: Difficult
File: Selectivity 2009 / Exercise 3.1
A lthough not usually be the normal way to solve it, I suggest that the dihedral projections of the circle (elliptical in both cases) are resolved by double depression. This makes it less messy to determine the axes of each ellipse that enable its path by the method of the card and does not need your drawing using the cumbersome method of conjugate diameters, as is the case for not raising the second depression.
The projections of the sphere are rather simple. Its center coincides with the circular section and its radius is drawn in true scale in any of the drawdowns.
Although not the only possible way to find the CD diameter, perpendicular to the plane, they decide to do with change of plane, through membership in the top section or outline of the new projection.
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