| Mathematics - 1835 - 684 pages
...Straight lines which pass through the same two points lie in the same straight line . . . ax. 4 (J>) **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, these two straight... | |
| Euclid - 1835 - 540 pages
...are together equal to two right angles. Wherefore, " when a straight line," &c. QED PROP. XIV. THEOR. **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... | |
| John Playfair - Geometry - 1836 - 148 pages
...makes with another on the same side of it, are together equal to two right angles. PROP. II. THEOR. **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 straight... | |
| Mathematics - 1836 - 488 pages
...another upon one side of it, are either two right angles, or are together equal to two right angles. XIV. **If, at a point in a straight line, two other straight lines,** upon the op. posite sides of it, make the adjacent angles together equal to two right angles, these... | |
| John Playfair - Euclid's Elements - 1837 - 332 pages
...angles DBA, ABC. PROP. XIV. THEOR. 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** are in one and the same straight line. At the point B in the straight line AB, let the two straight... | |
| Andrew Bell - Euclid's Elements - 1837 - 290 pages
...same three angles, are equal to one another ; that is, x = m-\-nx = two right angles. PROPOSITION XIY. **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... | |
| Euclid, James Thomson - Geometry - 1837 - 410 pages
...it but BD, which therefore is in the same straight line with CB. Wherefore, if at a point, &c. Cor. **If, at a point in a straight line, two other straight lines** meet on the opposite sides of it, and make equal angles with the parts of it on opposite sides of the... | |
| Charles Reiner - Geometry - 1837 - 246 pages
...which are these interior angles. 24. If, at one point in a straight line, two other straight lines **make the adjacent angles, together, equal to two right angles, these two** lines are in the same straight line. SECTION III. ONE TRIANGLE. M. — State all you have learnt concerning... | |
| Euclides - Geometry - 1841 - 378 pages
...therefore DBA, ABC are together equal to two right angles. Wherefore, the angles, &c. QED PROP. XIV. THEOR. **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... | |
| John Playfair - Euclid's Elements - 1842 - 332 pages
...angles ; because their sum is equal to that of the two adjacent angles DBA, ABC. PROP. XIV. THEOR. **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... | |
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