 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
 | Henry Martyn Taylor - Euclid's Elements - 1895 - 708 pages
...produced to G and the angle BAG 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 right angles, these two straight... | |
 | Queensland. Department of Public Instruction - Education - 1897 - 446 pages
...produced in order, all the exterior angles so formed are together equal to four right angles. 18 4. If at a point in a straight line, two other straight lines, on opposite sides of it, make tlie adjacent angles togethercqii.il to two right nn^lis, then these... | |
 | Seymour Eaton - 1899 - 362 pages
...; therefore the two angles ABC and ABD must be equal to two right angles. 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... | |
 | Euclid, Henry Sinclair Hall, Frederick Haller Stevens - Euclid's Elements - 1900 - 330 pages
...are supplementary ; and also that the angles AOY and BOY are supplementary. 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, then these two... | |
 | Manitoba. Department of Education - Education - 1900 - 558 pages
...triangles will be equal in all respects, and name the proposition in which each case is proved. 3. 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, then these two... | |
 | 1902 - 170 pages
...line on one side of it, are either two right angles or are together equal to two right angles ; and, 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... | |
 | 1902 - 482 pages
...Describe a parallelogram equal to a given triangle and having one of its angles equal to a given angle. 4. 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, then these... | |
 | American School (Chicago, Ill.) - Engineering - 1903 - 390 pages
...and DO E. Hence, the sum of the angles AOB, BOC, COD, and DOA = four right angles. THEOREn II. 34. If at a point in a straight line two other straight...angles, these two lines form a straight line. Let the sum of the adjacent angles ACD and BCD be equal to two right angles. To prove that ACB is a straight... | |
 | 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 lines, on opposite sides of it, make the adjacent angles together equal to two right angles, then these two... | |
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