The angle which is less than a right angle is called ___.

What is the representation of any matter by some sign or mark on the drawing known as?

When a line is perpendicular to one of the planes, it is ___ to the other plane.

The number of mutually perpendicular planes that can surround an object in space is ___.

The materials required for freehand sketching are ___.

A point is determined by the intersection of two ___.

The receding lines in an isometric projection are drawn ___.

Sectional lines are assumed to be drawn ___ to the axis of section.