 | Education - 2004 - 352 pages
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 | N. P. Bali, N. Ch. Narayana Iyengar - Engineering mathematics - 2004 - 1438 pages
...vectors represented by the other sides. (Punjab, 1986 S) 2. Prove that the line joining the mid-points of two sides of a triangle is parallel to the third side and half of it. (N. Bengal, 1989 ; Marathwada, 1990) 3. Prove that the lines joining the mid-points... | |
 | Mel Friedman, Michael Lee, Robert Bell, Suzanne Coffield, Adel Arshaghi, Lina Miceli, George DeLuca, Anita Price Davis, Joseph Fili, Marilyn Gilbert, Sally Wood, Michael McIrvin, Bernice E. Goldberg, Leonard Kenner - Education - 2005 - 878 pages
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 | Mel Friedman, Lina Miceli, Robert Bell, Michael Lee, Sally Wood, Adel Arshaghi, Suzanne Coffield, Michael McIrvin, Anita Price Davis, Research & Education Association, George DeLuca, Joseph Fili, Marilyn Gilbert, Bernice E. Goldberg, Leonard Kenner - Study Aids - 2005 - 886 pages
...the slope of BC. Denote it by m. 4-0 _ 1 10 + 6~4 m We know that a segment that joins the midpoints of two sides of a triangle is parallel to the third side. So, DE is parallel to BC, and as a result they have the same slope. Therefore, the slope of DE is -... | |
 | K. A. Stroud - Mathematics - 2005 - 366 pages
...QB-QB = 0 QB + QD = 0 Here is one more. Example 4 Prove by vectors that the line joining the mid-points of two sides of a triangle is parallel to the third side and half its length. Let D and E by the mid-points of AB and AC respectively. We have DE = M + ÄE... | |
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The line joining the middle points of two sides of a triangle is parallel to the third side and equal to half of the third side. 
