Books Books Wherefore, if a straight line, &c. QB D. PROPOSITION XXVIII. THEOB.—-If a straight line, falling upon two other straight lines, make the exterior angle equal to... The Elements of Geometry, Symbolically Arranged - Page 36
by Great Britain. Admiralty - 1846 ## The Elements of Euclid: With Many Additional Propositions ..., Part 1

Euclid - Geometry - 1853 - 176 pages
...lines (AB and CD), both in the same plane, and form internal angles at the same side (BGH and GHD) equal to two right angles, the two straight lines shall be parallel. DEMONSTRATION. Becanse the angles BGH and GHD are equal to two right angles (a), and the angles AGH... ## The Assurance Magazine, and Journal of the Institute of Actuaries, Volume 3

Insurance - 1853 - 394 pages
...another; (2) the exterior angle equal to the interior and remote upon the same side; and (3) the two interior angles upon the same side together equal to two right angles. 30. Draw through a given point between two straight lines not parallel a straight line which shall... ## The synoptical Euclid; being the first four books of Euclid's Elements of ...

Euclides - 1853 - 146 pages
...the third angle BAC to the third angle EDF. Therefore if two triangles, &c. QED PROP. XXVII. THEOREM. If a straight line, falling upon two other straight lines, make the alternate angles equal to one another, these two straight lines shall be parallel. Let the straight... ## The first six books of the Elements of Euclid, with numerous exercises

Euclides - 1853 - 176 pages
...fall upon two parallel straigM lines, ii makes the aliernate angles equal to one, another ; and tlie exterior angle equal to the interior and opposite upon the same side ; and likewise the two interior angles upon the same side together equal to two rigM angles. LET the... ## The popular educator, Volume 4; Volume 7

Popular educator - 1854 - 1274 pages
...the preceding exercise, the straight lines AB and o D are parallel. QED PROPOSITION XXVIII.*-THEOREM. If a straight line falling upon two other straight...exterior angle equal to the interior and opposite angle upon the lame side of the straight line ; or make the two interior angles upon the tame side... ## Elements of geometry and mensuration

Thomas Lund - Geometry - 1854 - 522 pages
...as already proved. COR. 2. If the two interior angles on the same side of the intersecting line are together equal to two right angles, the two straight lines shall be parallel. For, since / BEF ± t BEG =two right angles (30), .-. / BEF + t BEG = t BEF + L EFD, and .-. L EEG=t... ## Orr's Circle of the Sciences: Organic nature, vols. 1-3 (1854-1856)

William Somerville Orr - Science - 1854 - 532 pages
...straight lines (AB, CD) male the exterior angle (EGB) equal to the interior and opposite angle (GHD) upon the same side of the line; or make the interior angles (BGH, GHD) upon the same side together equal to tico right angles; the two straight lines (AB, CD)... ## The Elements of geometry; or, The first six books, with the eleventh and ...

Euclides - 1855 - 262 pages
...considered straight lines, aпd the figure EFDGB, a triangle, for the sake of the argument. Exercise 1.— If a straight line falling upon two other straight lines, make the exterior alternate angles AGE, FHD (see flg. to next proposition) equal to each other, these two straight lines... ## Cambridge examination papers: a suppl. to the University calendar, 1856-59

Cambridge univ, exam. papers - 1856 - 200 pages
...line fall upon two parallel straight lines, it makes the alternate angles equal to one another and the exterior angle equal to the interior and opposite upon the same side; and likewise the two interior angles upon the same side together equal to two right angles. If two... 