A line, to a draftsman, is an object line connecting two or more points (figure 21

on the previous page).

b. * Bisecting*. Bisecting is the geometric way of finding the center of a line or

an angle. In the following subparagraphs, we will discuss the two procedures for

bisecting a line and the procedure for bisecting an angle.

(1) *Bisect a Line - First Method *(figure 22 on the following page). Let's assume

we are given a line (1-2, view A). Our problem is that we have to divide this line

into two equal parts.

To divide the line into two equal parts, perform the

following steps:

Step 1. Construct an arc of radius R. Use point 1 as the center.

R = any radius

of greater length than 1/2 of line 1-2 (view B).

Step 2.

Construct an arc of radius R.

Use point 2 as the center (view C).

Step 3.

Define the intersection of the arcs as points 3 and 4 (view C).

Step 4.

Connect points 3 and 4 with a construction line (view D).

Step 5. Define point S where line 3-4 intersects line 1-2.

Line 1-5 is equal to

line 5-2