BisectionIntroductionProblem solving with geometric constructions often involves dividing a givenentity. Dividing geometric figures into two equal parts is called bisecting.The line that bisects the figure is known as a bisector. You should knowhow to bisect different geometric figures to accurately solve draftingproblems.Bisecting linesTo bisect a line or arc, use this table:or circular arcsStepAction1With a given arc or line (AB), use a compass set at a distancegreater than half the distance of the given line and draw equal arcsabove and below the given line.2Use a straightedge to join the intersections of the arcs. Thisstraight line locates the center of the given line or arc.Figure 2-18 shows how to bisect a line or arc.Figure 2-18.—Bisecting a line orarc.Continued on next page2-19

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