# Access Point #: MAFS.912.G-CO.4.AP.12c (Archived Access Point)

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Bisect a segment.

#### Essential Understandings

Concrete:

• When given a line segment, use manipulatives (ruler, compass, string, reflective devices, paper folding, dynamic geometric software, etc.) to bisect the given segment.

• Place compass point on A and stretch the compass MORE THAN half way to point B, but not beyond B.

• With this length, swing a large arc that will go BOTH above and below .
• Without changing the span on the compass, place the compass point on B and swing the arc again. The two arcs that have been created should intersect.

• With a straightedge, connect the two points of intersection.

• This new straight line bisects .
• Label the point where the new line and cross as C.
• has now been bisected and AC = CB. (It could also be said that the segments are congruent, .
Representation:
• Understand the following concepts and vocabulary: line segment, compass point, arc, intersect, bisect and congruent.
• Identify the mid-point of a line segment.

• Bisect means to divide into two equal parts.