 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.  Science Examination Papers - Page 44by Great Britain. Education Department. Department of Science and Art - 1899Full 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...adjacent angles together equal to two right angles, these two straight lines shall be in one and the same straight line. CBD At the point B in AB, let... | |
 | Euclides - 1884 - 94 pages
...FORM TO THIS. PROPOSITION XIV. If at a point in a straight line, tivo other straight lines, upon the opposite sides of it, make the adjacent angles together equal to two right angles ; then these two straight lines shall be in one and the same straight line. At the point in the 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 straight... | |
 | 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... | |
 | Euclides - 1884 - 182 pages
...angles thus formed cannot be both acute, nor can they be both obtuse. 49. 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... | |
 | Stewart W. and co - 1884 - 272 pages
...CBE, EBD, are two right angles ; therefore DBA, ABC, are together equal to two right angles. XIV. — 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... | |
 | E. J. Brooksmith - Mathematics - 1889 - 356 pages
...attached to accuracy. ~\ l. Define a. right angle, and a. rhombus. If, at a point in a straight line, two straight lines on opposite sides of it make the adjacent angles together equal to two right angles, they are in the same straight line. A OB, COD are two intersecting straight lines, and each of the... | |
 | George William Usill - Surveying - 1889 - 306 pages
...right angles. 5. If at a point in a straight line, AB, two other straight lines, c B and BD,upon the opposite sides of it, make the adjacent angles together equal to two right angles, these two straight lines, c B and BD, shall be in one and the same line. 6. If two straight lines cut... | |
 | 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 lines shall be in one and the... | |
| |
