Marks' first lessons in geometry / In two parts. Objectively presented, and designed for the use of primary classes in grammar schools, academies, etc.

by Bernhard Marks

Diagram 1.

A point may be represented by a dot. The point is in the center of the dot.

A point is that which denotes position only.

A line is named by naming the points at its ends.

Read all the lines in Diagram [1].

CROOKED LINES.

See Note [B], Appendix.

Does the line m n change direction at the point 1?

At what other points does it change direction?

It is called a crooked line.