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

Define a horizontal line.

Read all the oblique lines.

Why is s t an oblique line.

What is an oblique line?

Note.—Lines that point in the same direction do not approach the same point.

Diagram 4.

Diagram 5.