Clinographic projection belongs to the major class of projection called ___.

Drawing made to half of actual size is represented as ___.

In a logarithmic spiral, the ___ of lengths of constitutive radii enclosing equal angles is constant.

Freehand sketches are used for expressing and recording ___.

The vertical lines are always drawn from ___ to ___.

Natural north light is best suited for a ...

The ordinary photograph of an object is a ___.

The auxiliary view gives the ___ shape of the oblique surface.