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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... "
The Calcutta University Calendar - Стр. cxi
авторы: University of Calcutta - 1881
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Elements of Geometry: Containing the First Six Books of Euclid, with a ...

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...
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Pantologia. A new (cabinet) cyclopædia, by J.M. Good, O. Gregory ..., Том 5

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...
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The Elements of Euclid; viz. the first six books, together with the eleventh ...

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,...
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Elements of Geometry: Containing the First Six Books of Euclid, with a ...

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...
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Elements of Geometry: Containing the First Six Books of Euclid: With a ...

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 ;...
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Elements of Geometry: Containing the First Six Books of Euclid, with a ...

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...
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The Elements of Euclid: Viz. the First Six Books, Together with the Eleventh ...

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...
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The Elements of Euclid: viz. the first six books, together with the eleventh ...

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...
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The Teacher's Assistant in the "Course of Mathematics Adapted to the Method ...

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...
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Solid and Spherical Geometry and Conic Sections: Being a Treatise on the ...

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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