Books Books
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

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...

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...

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...

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»;...

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...

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...

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...

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...