To divide a line into proportional parts, use this table:
Given line AB, draw a perpendicular line at B.
Select any scale and set the first increment (0) at A.
Position the scale so that the total number of increments aligns with
the perpendicular line at B.
Set off the desired increments with tiny pencil marks. In this case
2, 3, and 4 units are marked.
Draw vertical lines through these points to the given line.
Figure 2-22.Dividing lines proportionately.
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