COPYING OR TRANSFERRING AN

ANGLE

A simple geometrical method can be used to copy

or transfer an angle. Figure 14-5 shows you how to do

this. To use this method, use the following steps to copy

angle AOB onto base line B´O´:

1. Insert one point of the dividers at point 0 (view

A). Adjust the other leg to intersect line A´O´ at

a distance that is convenient to work with.

2. Draw an arc that intersects both legs of the angle

(view A).

3. Look at view B. Without changing the

adjustment on the dividers, place the point on

point O´ and draw an arc intersecting the base

line.

To bisect an arc, you should follow the same steps

4. Look at view C. Use the dividers to measure

as those given for bisecting a line. Use the ends of the

between the legs of the angle where the arc cuts

arc (points A and B in fig. 14-3) as centers for the arcs

the legs. Transfer this measurement to line O´B´

that intersect.

by placing one point of the dividers at the

intersection of line O´B´ and the transferred arc.

Draw a short arc that intersects the transferred

are (view C).

Look at figure 14-4 as you read about bisecting an

5. Connect the intersection point of the two arcs to

angle. Use the following steps to bisect an angle:

point O´ to draw leg A´O´ and form A´O´B´ (view

1. Use the vertex of the angle as the center for one

D).

point of the dividers. Draw arcs cutting the legs

of the angle (view A).

2. Use the intersections of the arcs and the legs as

centers to draw arcs that intersect each other

inside the angle (view B).

You may wonder, why not just measure and divide

into the required number of parts? This is not a very

3. Connect the intersection point of these last two

arcs with the vertex of the angle to bisect the

angle (view C).

14-8

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