In perspective projection, the ___ plane is placed between the object and the eye.

A polygon is a plane figure having more than ___ straight lines.

Parallel ruling straight edge machines are used to draw _____:

The inclination between two perpendicular lines is called ___.

A good lettering is achieved by continuous ___.

An isometric projection is a  ___.

In isometric projection, circles are represented as ellipses of the object in ___.

Dimension lines should be drawn about 8 mm away from the ___ and from ___.