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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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## A Shorter Geometry

....'.z.DGH + /.CGH=2rt. AS, II and, by (1), /.CGH = z.GHF, .'.LDGH +/.GHF = 2rt. Ls. q. KD THEOREM I. 6. Straight lines which are parallel to the same straight line are parallel to one another. fig. 272. Data AB, CD are each || to XY. To prove that AB is || to CD. Construction Draw a st. line...
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## The London University Calendar

London univ - 1874
...2. Divide a given rectilineal angle into two equal angles. 3. Define Alternate Angles; and show that straight lines which are parallel to the same straight line are parallel to one another. What fraction of a right angle is the exterior angle of a regular heptagon? 4. Show that all the interior...
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## The New Geometry: Form One

G. P. West - 1965 - 316 páginas
...Since La = Lb, (proved in (i)) and since La + Ld=2 rt. LB, (ST stands on FSY) 1 = 2 rt. Ls. QED COR. Straight lines which are parallel to the same straight line are parallel to one another. ANGLE-SUM FOR TRIANGLE 237 THEOREM 6 (i). The sum of the angles of a triangle is equal to two right...
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## The New Zealand University Calendar, Volumen32

...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 Figures. The sum of the angles of a triangle is equal to two right angles....
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## Practical Geometry

Thomas Tate (Mathematical Master, Training College, Battersea.) - 1860 - 147 páginas
...angles on the same side of the cutting Hue are together equal to two right angles ... 8 THEOREM G. Straight lines which are parallel to the same straight line are parallel to one another 9 ANGLE-SUM FOR TRIANGLE AND POLYGON. PAGE THEOREM 8. The sum of the angles of a triangle is equal...
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## Annual Report of the Public Schools of the Province of British Columbia

...point in a given straight line, to make a rectilineal angle equal to a given rectilineal angle. • 5. Straight lines which are parallel to the same straight line are parallel to each other. 6. Triangles upon the same base and between the same parallels are equal to each other....
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