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Definition of Bisect

Bisect means to cut into 2 equal parts . If you bisect a 90 degree angle you create two 45 degree angles, as shown in diagram 1 below:

Diagram 1 bisected angle Diagram 2 bisected line segment

You can also bisect a segment. For instance segment AB is bisected by point C because point c divides the segment up into 2 smaller segments of equal length.