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. An Elementary Geometry and Trigonometry - Page 5by William Frothingham Bradbury - 1873 - 238 pagesFull view - About this book
| Euclides - 1877 - 58 pages
...D, and the angle BAD be bisected by AF ; shew that EAF is a right angle. PROPOSITION XIV. THEOREM. If at a point in a straight line two other straight lines upon the opposite sides of it make the adjacent angles togetlier equal to two right angles, these two straight... | |
| Thomas Hunter - Geometry, Plane - 1878 - 142 pages
...right angles. PROPOSITION XVI.—THEOREM. If two straight lines meet a third straight line, making the sum of the adjacent angles equal to two right angles, these two straight lines will form one and the same straight line. Let two straight lines, AB and BC, meet a... | |
| Moffatt and Paige - 1879 - 426 pages
...two right angles. Therefore, the angles which one straight line, etc. QED Proposition 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... | |
| W J. Dickinson - Geometry - 1879 - 44 pages
...of the bisections of the interior and exterior angles at the base are in the same straight line. 14. If at a point in a straight line two other straight lines, upon the opposite side of it, make the adjacent angles together equal to two right angles ; then these two... | |
| Joseph Wollman - 1879 - 120 pages
...point draw a straight line which shall make equal angles with two straight lines given in position. 31. 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... | |
| William Frothingham Bradbury - Geometry - 1880 - 260 pages
...therefore the sum of all the angles at the point B is equal to four right angles. THEOREM III. 47i If at a point in a straight line two other straight lines upon opposite sides of it .make the sum of tfie adjacent angles equal to two right angles, these two lines form a straight line. Let the straight... | |
| Euclides, Frederick Burn Harvey - Geometry - 1880 - 178 pages
...right side of the figure. - Ie the double angle on the left side of the figure. PROP. XIV. THEOREM. If at a point in a straight line, two other straight lines, upon opposite sides of it, make the adjacent angles together equal to two right angles, then these two straight lines shall be in one and... | |
| Pupil teachers - 1880 - 1494 pages
...of the bisections of the interior and exterior angles at the base are in the same straight line. 14. If at a point in a straight line two other straight lines, upon the opposite side of it, make the adjacent angles together equal to two right angles; then these two... | |
| Oxford univ, local exams - 1880 - 394 pages
...superficies, a square, a parallelogram. What is Euclid's axiom about lines which will meet when produced ? 2. 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... | |
| T S. Taylor - 1880 - 152 pages
...(Euclid I. 14). Repeat. — The enunciation of Euc. I. 13 and Axioms 3<z and n. General Enunciation. 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, those two... | |
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