_______ are lines which make an angle of 90 with each other.

• Perpendicular lines

• Parallel lines

• Straight lines

These pencils are used where extreme accuracy is required as on graphical computations on charts and diagrams.

• Soft

• Medium

• Hard

These grades are for general purpose work in technical writing.

• Soft

• Medium

• Hard

It is a drawing tool used to draw horizontal line and as a guide.

• Ruler

• T-square

• Triangle

________ is consisting of two legs, each with a needle point.

• Divider

• Bow instrument

• Erasing shield

A drawing tool that is often included in expensive drawing sets which include the bow pencil, bow pen and divider.

• Divider

• Bow instrument

• Erasing shield

________ are of various grades of hardness and softness.

• Drawing pencil

• Drawing pens

• Both a and b

__________are generally used for lettering, although the so-called technical pens.

• Drawing pencil

• Drawing pens

• Both a and b

It is a set of conventional lines symbols used in orthographic drawing.

• Alphabet

• Lines of alphabet

• Alphabet of lines

_______ are lines that are approximately 1/8” in length and spaced 1/32” between lines.

• Invisible line

• Visible line

• Transparent line