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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 38
by Great Britain. Admiralty - 1846

## Modern geometry [ed.] with an appendix by W.B. Jack

Richard Wormell - 1876 - 268 pages
...(c). " When a straight line, falling across two other straight lines, makes the two interior angles on the same side together equal to two right angles, the two straight lines are parallel." And conversely — (of). " When a straight line falls across two parallel straight lines...

## The Pupil teacher, a monthly educational journal. H. Major, ed

Henry Major - 1876 - 784 pages
...line fall upon two parallel straight Hues, 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 npon the same side together equal to two right angles. 3. Equal...

## The Teachers' assistant and pupil teachers' guide, Volume 1

1876 - 400 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. AB is...

## Elements of geometry, based on Euclid, books i-iii

Edward Atkins - 1876 - 130 pages
...equal to the third angle EDF(I. 4). Therefore, if two triangles, &c. QED Proposition 27. — 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...

## Elements of geometry, containing books i. to vi.and portions of books xi ...

Euclides, James Hamblin SMITH - 1876 - 382 pages
...side together equal to two right angles, and also the alternate angles equal to one another, and also the exterior angle equal to the interior and opposite upon the same tide. z T Let the st. line EF fall on the parallel st. lines AB, CD. Then must I. / s BGH, GHD together=two...

## Report of the Secretary for Public Instruction ...

Queensland. Department of Public Instruction - Education - 1881 - 386 pages

## Elements of geometry, based on Euclid, book i

Edward Atkins - 1877 - 72 pages
...equal to the third angle EDF (I. 4). Therefore, if two triangles, <kc. QED Proposition 27. — 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...

## Elements of geometry, containing books i. to vi.and portions of books xi ...

Euclides, James Hamblin Smith - 1879 - 376 pages
...26. PROPOSITION' XXVIII. THEOREM. If a straight line, falling upon two other straight lines, makt, the exterior angle equal to the interior and opposite...equal to two right angles; the two straight lines are parallel to one another. Let the st. line EF, falling on st. lines AB, CD, make I. L EGB = corresponding...