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Exercises from Illustrative MathematicsA set of 2 exercises, commentary, and solutions
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Using coordinates, students prove that the intersection of the medians of a triangle meet at a point that is two-thirds of the way along each median from the intersected vertex.Using coordinates, students prove the diagonals of a parallelogram bisect one another and meet at the intersection of the segments joining the midpoints of opposite sides.Teacher and Student versions of full lesson from engageNY
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Lessons, videos, exercises, and text from CK-12. Additional resources available at this site.
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