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" If a straight line be drawn through two sides of a triangle, parallel to the third side, a second triangle will be formed whose sides will be proportional to the corresponding sides of the first triangle. "
A Textbook on Marine Engineering ...: Steam and Steam Boilers, Steam Engines ... - Página 119
por International Correspondence Schools - 1900
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Elements of Geometry: With Practical Applications, for the Use of Schools

Timothy Walker - 1829 - 156 páginas
...The same might be proved of any number of equal ratios. OF PROPORTIONAL LINES. 70. THEOREM. — If a line be drawn through two sides of a triangle parallel to the third side, it divides those two sides proportionally. More depends upon this proposition than upon any other in...
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Elements of Geometry: With Practical Applications, for the Use of Schools

Timothy Walker - 1829 - 138 páginas
...demonstrate the following proposition, upon which more depends, than upon any other in geometry. — If a line be drawn through two sides of a triangle parallel to the third sidt, it ditides those two sides proportionally — . As the demonstration of this proposition is long,...
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Harvard Examination Papers

1873 - 192 páginas
...the ratio of two arcs described from their vertices as centres with equal radii. 4. Prove that a line drawn through two sides of a triangle parallel to the third side divides those two sides into proportional parts. 5. State and prove the proportion which exists between...
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Elements of Plane and Solid Geometry

George Albert Wentworth - 1877 - 416 páginas
...In like manner we may prove BC = CD, etc. GEOMETRY. — BOOK III. PROPOSITION II. THEOREM. 275. If a line be drawn through two sides of a triangle parallel to the third side, it divides those sides proportionally. Then Fig. 1. " Fig. 2. Ia the triangle ABC let EF be drawn parallel...
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Elements of Plane and Solid Geometry

George Albert Wentworth - 1877 - 416 páginas
...sides of equal A). In like manner we may prove B С — CD, etc. 140 PROPOSITION II. THEOREM. 275. If a line be drawn through two sides of a triangle parallel to the third aide, it divides those sides proportionally. A Fig. 1. Kg. 2. In the triangle ABC let EF be drawn parallel...
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A Geometry for Beginners

George Anthony Hill - 1880 - 332 páginas
...Two other theorems also follow from the preceding investigation : — Theorem II. — If a line is drawn through two sides of a triangle, parallel to the third side, a smaller triangle is formed which is similar to the given triangle. Theorem III. — A line drawn through...
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A Geometry for Beginners

George Anthony Hill - 1880 - 348 páginas
...parallel to the third side cuts off a smaller" triangle similar to the entire triangle. 11. A line drawn through two sides of a triangle parallel to the third side divides those sides proportionally. 12. I. Law of Similarity. — Two triangles are similar if they...
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Elements of Geometry

George Albert Wentworth - 1881 - 266 páginas
...like manner we may prove В С = CD, etc. GEOMETRY. — BOOK III. PROPOSITION II. THEOREM. 275. If a line be drawn through two sides of a triangle parallel to the third side, it divides those sides proportionally. A F'g. 1. P1g. 2. In the triangle AB С let EF be drawn parallel...
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A Text-book of Geometry

George Albert Wentworth - 1888 - 264 páginas
...them when referred to a common unit. PROPORTIONAL LINES. PROPOSITION I. THEOREM. 309. If a line is drawn through two sides of a triangle parallel to the third side, it divides those sides proportionally. Fio. 1. Fia. 2. In the triangle ABC let EF be drawn parallel...
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The Elements of Solid Geometry

William C. Bartol - 1893 - 112 páginas
...triangles. 360. In a parallelogram the opposite sides are equal and the opposite angles are equal. 361. If a line be drawn through two sides of a triangle parallel to the third side, it divides those sides proportionally. 362. Two triangles which have their sides respectively parallel...
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