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Read Ebook: Marks' first lessons in geometry In two parts. Objectively presented and designed for the use of primary classes in grammar schools academies etc. by Marks Bernhard
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Ebook has 1106 lines and 33828 words, and 23 pages
A line may be regarded as a succession of points.
The intersection of two lines is a point.
A point is named by placing a letter near it.
A point may be represented by a dot. The point is in the center of the dot.
A line is named by naming the points at its ends.
Read all the lines in Diagram 1.
CROOKED LINES.
See Note B, Appendix.
At what other points does it change direction?
It is called a crooked line.
CURVED LINES.
It is called a curved line.
STRAIGHT LINES.
It is called a straight line.
OTHER LINES.
It also is called a spiral line.
The line 7 8 looks like waves.
Footnote 1:
To be read seven, eight, not seventy-eight.
It is called a wave line.
Why? What is a straight line?
What kind of a line is 11 16?
Why? What is a crooked line?
Why? What is a curved line?
Why?
What kind of a line is 9 10?
Why? What is a spiral line?
Why?
LESSON SECOND.
REVIEW.
Read all the straight lines.
Define a straight line.
Read all the crooked lines.
Why is 7 8 a crooked line?
Define a crooked line.
Read all the curved lines.
Why is 5 6 a curved line?
What is a curved line?
Read all the wave lines.
Read all the spiral lines.
Why is 3 4 a spiral line?
What is a spiral line?
LESSON THIRD.
POSITIONS OF LINES.
Let the pupils hold their books so that they will be straight up and down like the wall.
VERTICAL LINES.
It is called a vertical line.
Name all the vertical lines.
HORIZONTAL LINES.
It is called a horizontal line.
Read all the horizontal lines.
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