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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.
Euclid - Page 31
by Euclid, Rupert Deakin - 1903 - 164 pages

## A Text-book of Euclid's Elements for the Use of Schools, Book 1

Euclid - Euclid's Elements - 1904 - 488 pages
...angles to one another. 3. Shew that the angles AOX and COY are complementary. PROPOSITION 14. THEOREM. If, at a point in a straight line, two other straight...adjacent angles together equal to two right angles, then these two straight lines shall be in one and the same straight line. /A At the point B in the...

## Annual Report of the Commissioners ..., Volume 72

1906 - 818 pages
...Inspector. Mr. J. CHAMBERS, District Inspector. SECTION A. 1. If at a point in a right line two other right lines on opposite sides of it make the adjacent angles together equal to two right angles, these two right lines form one continuous line. 2. If two triangles have two sides of one respectively equal...

## Intermediate Geometry: Being Sections V and VI of "geometry, Theoretical and ...

Walter Percy Workman - Geometry - 1908 - 228 pages
...another straight line on one side of it are together equal to two right angles (Euc. I. 13) 83 A.1c. — If at a point in a straight line, two other straight...right angles, these two straight lines shall be in the same straight line (Euc. I. 14) 84 A. 2. — Each of the angles formed by two intersecting straight...

## A School Geometry, Parts 1-4

Henry Sinclair Hall - 1908 - 286 pages
...the same angle are equal. (ii) Complements of the same angle are equal. 11 THEOREM 2. [Euc. I. 14.] If, at a point in a straight line, two other straight...adjacent angles together equal to two right angles, then these two straight lines are in one and the same straight line. 12 THEOREM 3. [Euc. I. 15.] If...

## Horses, Horsemen and Stable-management

Godfrey Bosvile - Horsemanship - 1908 - 316 pages
...adopt them ; but in no case may algebraical symbols, such as the minus sign, and AJP, be used.] 1. If, at a point in a straight line, two other straight...adjacent angles together equal to two right angles, then these two straight lines shall be in one and the same straight line. ABCD is a rhombus ; O,E,F...

## Report of the Examinations Conducted by the Council of Higher Education ...

Newfoundland Council of Higher Education - 1912 - 296 pages
...line perpendicular to a given straight line of unlimited length from a given point without it. A 4. If, at a point in a straight line, two other straight...adjacent angles together equal to two right angles, then these two straight lines shall be in one and the same straight line. (10) A 5. Prove that any...

## Report of the Examinations Conducted by the Council of Higher Education ...

Newfoundland Council of Higher Education - 1913 - 228 pages
...perpendicular bisectors of AD and BC intersect at O. Prove that AB and CD subtend equal angles at O. (6) 5. If, at a point in a straight line, two other straight lines on the opposite sides of it make the adjacent angles together equal to two right angles, prove that the...

## Journal of Education

Education - 1914 - 914 pages
...soldiers are angry (xoXorotVai) at the generals. GEOMETRY.— X. 9 to 11 am, Wednesday, 24 June, 1914. 1. If at a point in a straight line, two other straight lines, on opposite side* of it, make the adjacent angles together, equal to two right angles, then these two straight...