| 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... | |
| Manitoba. Department of Education - Education - 1900 - 580 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... | |
| 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... | |
| 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... | |
| 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... | |
| American School (Chicago, Ill.) - Engineering - 1903 - 392 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 lines upon** opposite sides of it make the sum of the adjacent angles equal to two right angles, these two lines... | |
| 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... | |
| 1906 - 818 pages
...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... | |
| 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 lines,** on opposite sides of it, make the adjacent angles together equal to two right angles, then these two... | |
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