The line joining the midpoints of two sides of a triangle is parallel to the third side and equal to one-half of it. Plane Geometry - Page 78by Fletcher Durell - 1904 - 372 pagesFull view - About this book
| Mathematical association - 1884 - 146 pages
...triangles. Ex. 5. Apply Theor. 2, Cor. 3, to shew that the straight line joining the middle points of two sides of a triangle is parallel to the third side. Ex. 6. Divide a triangle having its base angles acute into three parts, which shall together make up... | |
| Association for the improvement of geometrical teaching - Geometry, Modern - 1884 - 150 pages
...triangles. Ex. 5. Apply Theor. 2, Cor. 3, to shew that the straight line joining the middle points of two sides of a triangle is parallel to the third side. ' Ex. 6. Divide a triangle having its base angles acute into three parts, which shall together make... | |
| George Bruce Halsted - Geometry - 1885 - 389 pages
...second side, it will bisect the third side ; and, inversely, the sect joining the midpoints of any two sides of a triangle is parallel to the third side and equal to half of it. 233. Three or more lines which intersect in the same point are said to be Concurrent.... | |
| Webster Wells - Geometry - 1886 - 392 pages
...angles are right angles. PROPOSITION XLIV. THEOREM. 130. The straight line joining the 'middle points of two sides of a triangle is parallel to the third side and equal to one-half of it. A In the triangle ABC, let B' be the middle point of AB and C" of AC. To prove... | |
| George Bruce Halsted - Geometry - 1886 - 394 pages
...second side, it will bisect the third side ; and, inversely, the sect joining the midpoints of any two sides of a triangle is parallel to the third side and equal to half of it. 233. Three or more lines which intersect in the same point are said to be Concurrent.... | |
| George Albert Wentworth - Geometry, Analytic - 1886 - 346 pages
...diagonals of a square are perpendicular to each other. 53. Prove that the line joining the middle points of two sides of a triangle is parallel to the third side. 55. Show that the three points (3«, 0), (0, 3ft), (a, 2b) are in a straight line. 56. Show that the... | |
| William Chauvenet, William Elwood Byerly - Geometry - 1887 - 331 pages
...AC. See now Proposition VII. and Proposition XXIX. 29. The straight line joining the middle points of two sides of a triangle is parallel to the third side, (v. Exercise 28.) 30. The three straight lines joining the middle points of the sides of a triangle... | |
| William Chauvenet, William Elwood Byerly - Geometry - 1887 - 336 pages
...AC. See now Proposition VII. and Proposition XXIX. 29. The straight line joining the middle points of two sides of a triangle is parallel to the third side. (v. Exercise 28.) 30. The three straight lines joining the middle points of the sides of a triangle... | |
| George Albert Wentworth - Geometry - 1888 - 264 pages
...transversal AC; that is, the line DE bisects AC. 189. COR. 2. The line which joins the middle points of two sides of a triangle is parallel to the third side, and is equal to half the third side. For, a line drawn through D, the middle point of AB, II to BC, passes through... | |
| John Bascombe Lock - Forces and couples - 1888 - 278 pages
...another piece of cardboard. Shew that their cGs are superposed. The line joining the middle points of two sides of a triangle is parallel to the third side of the triangle and is bisected by the line joining the middle point of the third side to the opposite... | |
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