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If, at a point in a straight line, two other straight lines upon the opposite sides of it, make the adjacent angles, together equal to two right angles, these two straight lines shall be in one and the same straight line.
Elements of Geometry;: Containing the First Six Books of Euclid, with Two ... - Pagina 18
door John Playfair - 1795 - 400 pagina’s
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## Elements of geometry, containing the first two (third and fourth ..., Deel 1

Euclides - 1871
...supplement of / ABC. If, at a point in a straight line, two other straight lines, upon the opposite sides of it, make the adjacent angles together equal to two right angles, these two straight lines must be in one and the same straight line. At the pt. B in the st. line AB...
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## The Elements of Plane and Solid Geometry

Henry William Watson - 1871 - 285 pagina’s
...the angle BED. PROPOSITION 13. If at a point in a straight line two straight lines on opposite sides of it make the adjacent angles together equal to two right angles, or make the vertically opposite angles equal to one another, these two straight lines shall be in one...
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## Elements of geometry, containing books i. to vi.and portions of books xi ...

Euclides, James Hamblin Smith - 1872 - 349 pagina’s
...XIV. THEOREM. If, at a. point in a straight line, two other straight lines, upon the opposite sides of it, make the adjacent angles together equal to two right angles, these two straight lines must be \$n_ one and the same straight line. At the pt. B in the st. line AB...
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## The Acting Teacher's and Student's in Training Guide and Text Book for ...

Henry Major - 1873
...angles. XlV. — If, at a point in a straight line, two other straight lines, upon the opposite sides of it, make the adjacent angles together equal to two right angles, these two straight lines shall be in one and the same straigJit line. At the point B in the straight...
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## The Elements of Euclid, containing the first six books, with a selection of ...

Euclides - 1874
...14. — Theorem. If at a point in a straight line, two other straight lines upon the opposite sides of it, make the adjacent angles together equal to two right angles, then these two straight lines shall be in one and the same straight line. At the point B in the straight...
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## Euclidian Geometry

Francis Cuthbertson - 1874 - 349 pagina’s
...PROPOSITION X. If two straight lines, drawn from one extremity of a straight line on opposite sides of it, make the adjacent angles together equal to two right angles, these two straight lines shall l>e in one and the same straight line. Let BC, BD drawn from B one extremity...
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## A school Euclid, being books i. & ii. of Euclid's Elements, with notes by C ...

Euclides - 1874
...because at the point H in the straight line GH, the two straight lines KH, HM, on the opposite sides of it, make the adjacent angles together equal to two right angles, KH is in the same straight line with HM. [I. 14.] And because the straight line HG meets the parallels...
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## The Teachers' assistant and pupil teachers' guide, Volume 1

1876
...EUCLID. — 1. If at a point in a straight line, two other straight lines, upon the opposite sides of it, make the adjacent angles together equal to two right angles, these two straight lines shall be in one and the same straight line. 2. If two triangles have two angles...
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## Elements of geometry, based on Euclid, books i-iii

Edward Atkins - 1876 - 119 pagina’s
...— Theorem. If, at a, point in a straight line, two other straight lines, upon the opposite sides of it, make the adjacent angles together equal to two right angles, these two straight lines shall be in one and the same straight line. civcn At the point B in the straight...
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## The Pupil teacher, a monthly educational journal. H. Major, ed

Henry Major
...proposition ? 2. If at a point in a straight line, two other straight lines, upon the opposite sides of it, make the adjacent angles together equal to two right angles, then these two straight lines shall be in one and the same straight line. of the other, the base of...
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