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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.
The Elements of Geometry, Symbolically Arranged - Side 21
av Great Britain. Admiralty - 1846
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## Intermediate Geometry: Being Sections V and VI of "geometry, Theoretical and ...

Walter Percy Workman - 1908
...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 lines on opposite sides of it make the adjacent angles together equal to two right angles, these two straight...
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## The Irish Law Times and Solicitors' Journal, Volum 37

1903
...non-adjacent angles. 1. Prove that, it at a point in a right liiic, two other right lines on opposite sides make the adjacent angles together equal to two right angles, these two right lines form one continuous rignt line. 3. If a parallelogram and a triangle be on the same base...
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## Logic from a Rhetorical Point of View

Witold Marciszewski - 1994 - 312 sider
...formulation of general theorems in the example of Euclid's Theorem 14 of Book I. It runs as follows: 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, these two...
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## Annual Report of the Public Schools of the Province of British Columbia

...kind ? 7. The sum of a certain number and its square root is 90. What is the number? GEOMETRY. 1. (a.) If, at a point in a straight line, two other straight...equal to two right angles, these two straight lines must be in one and the same straight line. (b.) Give the enunciations of propositions that prove the...
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## Parliamentary Papers, Volum 40

...SECTION I. 1. If at a point in a given straight line, two other straight lines on the opposite side of it make the adjacent angles together equal to two right angles, these straight lines are in one and the same straight line. 2. To describe a square which shall be equal...
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## The Elements of Plane Geometry

Euclid - 1845 - 262 sider
...quadrilateral such that BC = AD and AC = BD ; if AC, BD meet in O, show that OA = OB. 39. PROP. 1 2. If, at a point in a straight line, two other straight lines on opposite sides of it make the adjacent angles together equal to two right angles, those two straight...
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## A First Course of Geometry

...circle centre O, and D is the mid-point of AB ; show that OD is perpendicular to BC. 25. PROP. 12. If, at a point in a straight line, two other straight lines on opposite sides of it make the adjacent angles together equal to two right angles, those two straight...
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