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 Bisector of a line:  In a plane, a bisector of a line divides a line segment into two congruent segments.

Paper Folding: Fold a sheet of paper into three equal areas.

Quadrilaterals Inscribed Inside Quadrilaterals: Explore properties of quadrilaterals constructed using the midpoints of the sides of given quadrilaterals.

Quadrilateral Conjectures: Make conjectures about properties of quadrilaterals and provide examples or counterexamples.

Balancing the Centroid: Describe how a triangle's median is divided.