Descriptive geometry problems

Descriptive geometry is constructive—that is, one uses conventional mechanical drawing tools: namely, compass, ruler, protractor, divider, triangles etc to construct solutions to geometric problems.
Geometry : Example Question #1
If the measure of angle APC is eighty-one degrees larger than the measure of angle DPB, and the measures of angles CPD and DPB are equal, then what is the measure, in degrees, of angle CPB?

Descriptive geometry deals with manually solving problems in three-dimensional geometry through working with two-dimensional planes using these basic mechanical tools. This course is mainly about the techniques of solving three-dimensional geometry problems manually.

Descriptive geometry deals with manually solving problems in three This course is mainly about the techniques of solving three-dimensional geometry problems

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