 | G. P. West - Geometry - 1965 - 362 pages
...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... | |
 | 464 pages
....'.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... | |
 | British Columbia. Superintendent of Education - 1897 - 710 pages
...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.... | |
 | University of Bombay - 1910 - 1080 pages
...right angles, then the two straight lines are parallel ; and the converse. Straight lines which arc parallel to the same straight line are parallel to one another. Triangles and Rectilineir Figures. The mm of the angles of a triangle is equal to two right angles. If the sides... | |
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Straight lines which are parallel to the same straight line are parallel to one another. 
