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" If three straight lines meet all in one point, and a straight line stand at right angles to each of them in that point ; these three straight lines are in one and the same plane. Let the straight line AB stand at right angles to each of the straight lines... "
An elementary course of mathematics - Page 9
by Samuel Hunter Christie - 1847
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The Elements of Euclid: The Errors, by which Theon, Or Others, Have Long Ago ...

Robert Simson - Trigonometry - 1762 - 488 pages
...in one and the fame plane. Let the ftraight line AB ftand at right angles to rrch of th<* ftraight lines BC, BD, BE, in B the point where they meet; BC, BD; BE are in one and the fanta. plane. If not, let, if it be poffible, BD and BE be in one phiie, and BO b3e above it ; and...
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The Elements of Euclid: The Errors, by which Theon, Or Others, Have Long Ago ...

Robert Simson - Trigonometry - 1781 - 534 pages
...are in one and the fame plane. Let the ftraight line AB itnnd at right angles to each of the ftraight lines BC, BD, BE, in B the point where they meet; BC, BD, BE are in one an.i the fame plane. If not, let, if it be poilible, BD and BE be in one plane, and BC be above it...
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The Elements of Euclid: Viz. the First Six Books, with the Eleventh and ...

Alexander Ingram - Trigonometry - 1799 - 374 pages
...are in one and the fame plane. Let the ftraight line AB Hand at right angles to each of the ftraight lines BC, BD, BE, in B the point where they meet ; BC, BD, BE are in one and the fame plane. If not, let, if it be poffible, BD and BE be in one plane, and BooK XI. BC be above it;...
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The Elements of Euclid: Also the Book of Euclid's Data ...cor. viz. The ...

Robert Simson - Trigonometry - 1804 - 530 pages
...are in one and the fame plane. Let the ftraight line AB fland at right angles to each of the ftraight lines BC, BD, BE, in B the point where they meet; BC, BD, BE are in one and the fame plane. If not, let, if it be poffible, BD and BE be in one plane, and BC be above it ; and let...
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The Elements of Euclid: The Errors, by which Theon, Or Others, Have Long Ago ...

Robert Simson - Trigonometry - 1806 - 546 pages
...in that point ; these three straight lines are in one and the same plane. Let the straight line AB stand at right angles to each of the straight lines...the same plane. If not, let, if it be possible, BD und BE be in one plane, and BC be above it ; and let a plane pass through AH, BC, the common section...
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Elements of Geometry: Containing the First Six Books of Euclid, with a ...

John Playfair - Mathematics - 1806 - 320 pages
...are in one and (he same plane. Let the straight line AB stand at right angles to each of the three straight lines BC, BD, BE, in B, the point where they...it be possible, BD and BE be in one plane, and BC above it ; and let a plane pass through AB, BC ; then the common section of this plane with the plane...
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The Elements of Euclid: Viz. the First Six Books, Together with the Eleventh ...

Euclid - Geometry - 1810 - 554 pages
...them in that point; these three straight lines are in one and the same plane. Let the straight line AB stand at right angles to each of the straight lines...BC, BD, BE are in one and the same plane. If not, leti if it be possible; B!) and BE be in one plane, and BC be above it; and let a plane pass through...
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The Elements of Euclid; viz. the first six books, together with the eleventh ...

Euclides - 1814 - 560 pages
...point; these three straight lines are in one and the same plane. Let the straight line AB stand ęt right angles to each of the straight lines BC, BD,...point where they meet; BC, BD, BE, are in one and the s;ime planer If not, let, if it be possible, BD and BE be in one plane, and BC be above it ; and let...
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Elements of Geometry: Containing the First Six Books of Euclid: With a ...

John Playfair - 1819 - 354 pages
...in that point : these three straight lines are in one and the same plane. Let the straight line AB stand at right angles to each of the straight lines...BD, BE are in one and the same plane. If not, let BD and BE, if possible, be in one plnne, and BC be above it ; and let a plane pass through AB, BC,...
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Elements of Geometry: Containing the First Six Books of Euclid, with a ...

John Playfair - Circle-squaring - 1819 - 350 pages
...that point : these three straight lines are in one and the same plane. ~\ Let the straight line AB stand at right angles to each of the straight lines...meet ; BC, BD, BE are in one and the same plane. If aot, let BD and BE, if possible, be in one plane, and BC be above it ; and let a plane pass through...
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