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Example 1:

A midsegment of a triangle is a segment that joins the midpoints of two sides of the triangle. Every triangle has three midsegments, which form the midsegment triangle.

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Example 1:

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  1. A midsegment of a triangleis a segment that joins the midpoints of two sides of the triangle. Every triangle has three midsegments, which form the midsegment triangle.

  2. The vertices of ∆XYZ are X(–1, 8), Y(9, 2), and Z(3, –4). M and N are the midpoints of XZ and YZ. Show that and . Since the slopes are the same, Example 1: Step 1 Find the coordinates of M and N. Step 2 Compare the slopes of MN and XY.

  3. Step 3 Compare the heights of MN and XY.

  4. The relationship shown in Example 1 is true for the three midsegments of every triangle.

  5. Example 2A: Find each measure. BD ∆ Midsegment Thm. Substitute 17 for AE. BD = 8.5 Simplify. mCBD ∆ Midsegment Thm. mCBD = mBDF Alt. Int. s Thm. mCBD = 26° Substitute 26° for mBDF.

  6. Example 3: Indirect Measurement Application In an A-frame support, the distance PQ is 46 inches. What is the length of the support ST if S and T are at the midpoints of the sides? ∆ Midsegment Thm. Substitute 46 for PQ. ST= 23 Simplify. The length of the support ST is 23 inches.

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