Mid-Segment of a Triangle
Videos, worksheets, solutions and activities to help Geometry students learn how to construct the mid-segment of a triangle.
A triangle mid-segment is a line segment whose endpoints are the midpoints of a triangle. The triangle mid-segment is parallel to the third side (the side that does not contain an endpoint). Also, the mid-segment is half the length of the third side.
Midsegment of a Triangle
Students learn the following theorems related to parallel lines. If 3 parallel lines form congruent segments along one transversal, then they form congruent segments along every transversal. If a line intersects the midpoint of one side a triangle and is parallel to another side of the triangle, then it intersects the midpoint of the third side of the triangle. If a segment joins the midpoints of two sides of a triangle, then the segment is (a) parallel to the third side of the triangle, and (b) half the length of the third side.
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