 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 - 1884 - 434 pages
...ways. If the exterior angles thus formed are equal, prove A ABC isosceles. PROPOSITION 14. THEOREM. 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... | |
 | Euclides - 1884 - 214 pages
...Magnitudes which are equal to the same magnitude are equal to one another. PROPOSITION XIV. THEOREM. If, at a point in a straight line, two other straight lines, on the bpposite sides of it, make the adjacent angles together equal to two right angles; these two... | |
 | Education - 1884 - 708 pages
...equal sides be produced, the angles on the other side of the base shall be equal. Prop. 5, Bk. I. 2. If at a point in a straight line, two other straight lines, «l'on the opposite sides of it, make the adjacent angles together eqaal to two right angles ; then... | |
 | Edward Mann Langley, W. Seys Phillips - 1890 - 538 pages
...complementary to each Other; and each is called the complement of the other. PROPOSITION 14. THEOREM. If at a point in a straight line two other straight lines on opposite sides of it make adjacent angles together equal to two right angles, these two straight... | |
 | Euclid - Geometry - 1890 - 442 pages
...and BXP. But each of these last is a right A . .-. AXY + BXY = twort. As. Proposition 14. THEOREM — 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 tivo right angles, these two... | |
 | James Andrew Blaikie, William Thomson - Geometry - 1891 - 160 pages
...straight lines meet in a point, the angles formed shall be together equal to four right angles. i 14. If at a point in a straight line two other straight lines on opposite sides of it make adjacent angles which are together equal to two right angles, these two... | |
 | Rupert Deakin - Euclid's Elements - 1891 - 102 pages
...straight line on one side of it are either two right angles or are together equal to two right angles. 14. 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... | |
 | Euclid, John Bascombe Lock - Euclid's Elements - 1892 - 188 pages
...equal. 7. With the construction of Question 6 shew that FA bisects the angle BAC. Proposition 14. 91. 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... | |
 | Henry Martyn Taylor - 1893 - 486 pages
...produced to G and the angle IiAG bisected, the two bisecting lines are at right angles. PROPOSITION 14. 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 rigM angles, these two straight... | |
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