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" Straight lines which are parallel to the same straight line are parallel to one another. Triangles and Rectilinear Figures. The sum of the angles of a triangle is equal to two right angles. "
Elements of Geometry: Containing the First Six Books of Euclid with a ... - Página 29
por John Playfair - 1855 - 318 páginas
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The Teaching of Mathematics in the United Kingdom, Parte1

Great Britain. Board of Education - 1912
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Special Reports on Educational Subjects, Volúmenes26-27

Great Britain. Board of Education - 1912
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Regulations

University of Calcutta - 1914 - 409 páginas
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Bulletin, Temas33-43

1915
...are together equal to two right angles, then the two straight lines are parallel; and the converse. Straight lines which are parallel to the same straight line are parallel to one another. Triangles and rectilinear figure». — The sum of the angles of a triangle ie equal to two right angles....
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Mathematics in the Lower and Middle Commercial and Industrial ..., Temas34-42

Edson Homer Taylor - 1915 - 96 páginas
...are together equal to two right angles, then tha two straight lines are parallel; and the converse. Straight lines which are parallel to the same straight line are parallel to one another. Triangles and rectilinear figures. —The sum of the angles of a triangle is equal to two right angles....
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Statistics of Land-grant Colleges and Universities, Volumen3,Temas31-44

United States. Office of Education - 1915
...are together equal to two right angles, then tha two straight lines are parallel; and the converse. Straight lines which are parallel to the same straight line are parallel to one another. Triangles and rectilinear figures. — The sum of the angles of a triangle is equal to two right angles....
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Plane Geometry

John Wesley Young, Albert John Schwartz - 1915 - 223 páginas
...connection with a drafting board (see Fig. 1, p. 1) or a draftsman's triangle (see Fig. 29). 81. Two straight lines which are parallel to the same straight line are parallel to each FIG. 29. other. 82. A straight line which is perpendicular to one of two parallel lines is perpendicular...
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The Texas Outlook

1944
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Plane Geometry

Edith Long, William Charles Brenke - 1916 - 276 páginas
...corner, also from mid-point of side to mid-point of side, as shown in the figure. Assuming that the lines which are parallel to the same straight line are parallel to each other no matter whether they are all in the same plane or not, prove the following statements...
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Plane Geometry

Edith Long, William Charles Brenke - 1916 - 276 páginas
...corner, also from mid-point of side to mid-point of side, as shown in the figure. Assuming that the lines which are parallel to the same straight line are parallel to each other no matter whether they are all in the same plane or not, prove the following statements:...
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