 | John Playfair - 1806 - Страниц: 311
...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
...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
...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 - Страниц: 333
...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 - Страниц: 317
...&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 - Страниц: 333
...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 - Страниц: 513
...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 - Страниц: 513
...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 - Страниц: 472
...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 - Страниц: 164
...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... 
