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" AB shall be at right angles to the plane CK. Let any plane DE pass through AB, and let CE be the common section of the planes DE, CK ; take any point F in CE, from which draw FG in the plane DE at right D angles to CE ; and because AB is , perpendicular... "
The Elements of Euclid, Viz: The Errors, by which Theon, Or Others, Have ... - Page 211
by Robert Simson - 1775 - 520 pages
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The Elements of Euclid: The Errors, by which Theon, Or Others, Have Long Ago ...

Robert Simson - Trigonometry - 1762 - 466 pages
...at right angles to the plane CK. Let any plane DE pafs through AB, and let CE be the common fection of the planes DE, CK ; take any point F in CE, from...perpendicular to CE, wherefore ABF is a right angle ; but GFB is likewife a D GAH 1 ajDtf.M. CFBE right angle ; therefore AB is parallel b to FG. and AB is at...
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The Elements of Euclid: The Errors, by which Theon, Or Others, Have Long Ago ...

Robert Simson - Trigonometry - 1781 - 466 pages
...at right angles to the plane CK. Let any pb.ne DE pafi through AB, and let CE be the common feftion of the planes DE, CK ; take any point F in CE, from...draw FG in the plane DE at right angles to CE. and Jiecaufe AB is perpendicular to the plane CK, therefore it is allb perpendicular to every ftruight...
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The First Six Books: Together with the Eleventh and Twelfth

Euclid - 1781 - 520 pages
...at right angles to the plane CK. Let any plane DE pafs through AB, and let CE be the common fe&ion of the planes DE, CK ; take any point F in CE, from...which draw FG in -^ , , the plane DE at right angles U IT A -Tito CE : And becaufe AB is perpendicular to the plane CK, therefore it is alfo perpendicular...
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Elements of Geometry;: Containing the First Six Books of Euclid, with Two ...

Euclid, John Playfair - Electronic book - 1795 - 400 pages
...plane CK. Let any plane DE pafe through AB, and let CE be the common fectipn of the.planes DE, CR ; take any point F in CE, from which draw FG in the...to CE: And becaufe AB is perpendicular to the plane J) G- A. . H CK, therefore it is alfo "' perpendicular to every ftrnight line meeting it in that plane»;...
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The Elements of Euclid: Viz. the First Six Books, with the Eleventh and ...

Alexander Ingram - Trigonometry - 1799 - 351 pages
...at right angles to the plane CK. Let any plane DE pafs through AB, and let CE be the common fection of the planes DE, CK ; take any point F in CE, from which draw FG in the plane DE at rigiit angles to CE : And becaufe AB is perpendicular to the plane CK, therefore it is alfo perpendicular...
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The Elements of Euclid: Also the Book of Euclid's Data ...cor. viz. The ...

Robert Simson - Trigonometry - 1804
...at right angles to the plane CK. Let any plane DE pafs through AB, and let CE be the common feftion of the planes DE, CK ; take any point F in CE, from...in that plane meeting it ». and confequently it is perpendia. 16. ii. b. 2. 6. c. ii. 5. 3) Or AH cular to CE, wherefore ABF is . a right angle; but GFB...
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Elements of Geometry;: Containing the First Six Books of Euclid, with a ...

Euclid, John Playfair - Circle-squaring - 1804 - 440 pages
...at right angles 10 the plane CK. Let any plane DE pafs through AB, and let CE be the common feftion of the planes DE, CK ; take any point F in CE, from...CE : And becaUfe AB is perpendicular to the plane T) rj. A TT CK, therefore it is alfo perpendicular to every ftraight line meeting it in that plane...
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Elements of Geometry: Containing the First Six Books of Euclid, with a ...

John Playfair - Euclid's Elements - 1806 - 311 pages
...at right angles to the plane CK. Let any plane DE pass through AB, and let CE be the common section of the planes DE, CK ; take any point F in CE, from...which draw FG in the plane DE at right angles to CE. Because AB is perpendicular to the plane CK, it is also perpendicular to every straight line meeting...
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The Elements of Euclid: The Errors, by which Theon, Or Others, Have Long Ago ...

Robert Simson - Trigonometry - 1806 - 518 pages
...plane DE pass through AB, and let CE be the common section of. the planes DE, CK ; take any point f fa CE, from which draw FG in the plane DE at right angles to CE : and becanse AB is perpendicular to the plane CK, therefore it is also perpendicular to every straight line...
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The Elements of Euclid: Viz. the First Six Books, Together with the Eleventh ...

Euclid - Geometry - 1810 - 518 pages
...at right angles to the plane CK.Let any plane DE pass through AB, and let CE be the common section of the planes DE, CK; take any point F in CE, from which draw FG in the DG AH plane DE at right angles to CE: and because AB is perpendicular to the plane CK, therefore it...
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