Lesson Angle Bisector
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Geometry: Angles, complementary, supplementary angles
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In general 'to bisect' something means to cut it into two equal parts. The 'bisector' is the thing(usually a line) doing the cutting into two equal parts. In an <b>angle bisector</b>, it is a line passing through the vertex of the angle that cuts it into two equal smaller angles. {{{drawing( 160, 160, -3.5, 4.5, -0.5, 5.0, line( 0, 0, 4, 0 ), line( 0, 0, 2.5, 3.1 ),line( 0, 0, -2, 3.464 ), locate( 0, 0, A ), locate( 4, 0, B ),locate( 2.5, 4, D ),locate(-2.5, 4, C ))}}} In the above diagram, line AD bisects the {{{AngleBAC}}}. {{{AngleBAD = AngleDAC}}} Each point on the line AD(angle bisector) is equidistant from the line AB and line AC. For more information refer to <A HREF=Angle_bisector.wikipedia>Angle Bisector</A>.
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