 | John Playfair - 1806 - 320 pàgines
...if two straight lines, &c. QED PROP. VII. THEOR. IF two straight lines be parallel, and one of them at right angles to a plane, the other is also at right angles to the same plane. Let AB, CD be two parallel straight lines, and let one of Book II. them AB be at right angles to a... | |
 | John Mason Good - 1813 - 714 pàgines
...in the other, is in the same plane with the parallels. Prop. VIII. Theor. If two straight lines be parallel, and one of them is at right angles to a plane ; the other also shall be at right angles to the same plane. Prop. IX. Theor. Two straight lines which are each... | |
 | Euclides - 1814 - 560 pàgines
...lines, &c. Q. E, D. space between them, which is (• i j D PROP. VIII. THEOR. IF two straight lines be parallel, and one of them is at right angles to a plane; the other also shall be at right angles to the same plane. O2 Bonx XI. Let AB, CD be two parallel straight lines,... | |
 | John Playfair - 1819 - 350 pàgines
...two straight lines, &c. Q, ED PROP. VII. THEOR. ff twu straight lines 'be parallel, and one of them, at right angles to a plane ; the other is also at right angles to the same plane. Let AB, CD be two parallel straight lines, and let one of them AB be at right angles to a plane ; the... | |
 | John Playfair - 1819 - 354 pàgines
...&c. QED PROP. VII. THEOR. (/ ITUO straight lines be parallel, and one of them jfl right angles to n plane ; the other is also at right angles to the same plAne. Let AB, CD be two parallel straight lines, and let. one of them AB Gbe at right angles to a plane ;... | |
 | John Playfair - 1833 - 346 pàgines
...lines, &c. QED PROP. VII. THEOR. If two straight lines be parallel, arid one of them at right angles td a plane ; the other is also at right angles to the same plane. Let AB, CD be two parallel straight lines, and let one of them be at right angles to a plane ; the... | |
 | Euclid - 1835 - 540 pàgines
...and DA, BC is at right angles'1 to the plane passing through ED, DA. And GH is parallel to BC; but if two straight lines are parallel, and one of them is at right e& 11. angles to a plane, the other is at right' angles to the same plane; wherefore GH is at right... | |
 | Robert Simson - 1835 - 544 pàgines
...ED and DA, BC is at right anglesd to the plane passing through ED, DA. And GH is parallel to BC; but if two straight lines are parallel, and one of them is at right e8. 11. angles to a plane, the other is at right c angles to the same plane; wherefore GH is at right... | |
 | 1836 - 488 pàgines
...the same plane, are parallel to one another. VII. If two straight lines be parallel, and one of them at right angles to a plane; the other is also at right angles to the same plane. VIII. Two straight lines which are each of them parallel to the same straight line, though not both... | |
 | A. Bell - 1837 - 180 pàgines
...is a right angle ; therefore AB is parallel to CD. PROPOSITION VIL THEOREM. If two straight lines be parallel, and one of them is at right angles to a plane, the other also shall be at right angles to the same plane. Let AB, CD, be two parallel straight lines, and let... | |
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be parallel, and one of them, at right angles to a plane ; the other is also at right angles to the same plane. Let AB... 
