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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 Examination Statutes ... Together with the Regulations of the Boards of ...

University of Oxford - 1913
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## A Survey of Geometry

Howard Eves - 1972 - 442 páginas
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## Register

University of Cambridge - 1912
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## The Educational Directory and Yearbook of China

1916
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## Calendar

University of Birmingham - 1910
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## Elementary Geometry

Olaus Henrici - 1888 - 188 páginas
...eqnal. (ii) If a triangle has one of its angles a right angle, two of its angles are acute. THEOREM 6. Straight lines which are parallel to the same straight line are parallel to one another. A f B C k D I I fig. 89. Data AB, CD are each || to XY. To prove that AB is || to CD. Construction...
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## A Shorter Geometry

...(2) corresponding angles are equal, (3) the interior angles on the same side of the PAGE THEOREM 6. Straight lines which are parallel to the same straight line are parallel to one another . . , 263 THEOREM 7. If straight lines are drawn from a point parallel to the arms of an angle, the...
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## Paractical Geometry Based on the Various Geometry Books by Godfrey and Siddons

...and (iii). IIEx. 6. Prove Th. 5 (iii) by Playfair's Axiom and deduce Th. 5 (i) and (ii). | THEOREM 6. Straight lines which are parallel to the same straight line are parallel to one another. I Pig. 7. Data AB, CD are each || to XY. To prove that AB is || to CD. Construction Draw a st. line...
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## General Announcement - McGill University

McGill University - 1910
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