Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Books Books 21 - 30 of 55 on AB, CD. In like manner, it may be proved, that FE makes right angles with every straight....  
" AB, CD. In like manner, it may be proved, that FE makes right angles with every straight line which meets it in that plane. But a straight line is at right angles to a plane when it makes right angles with every straight line which meets it in that plane... "
Books 10-13 and appendix - Page 279
by Euclid, Sir Thomas Little Heath, Johan Ludvig Heiberg - 1908
Full view - About this book

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

Euclides - 1841
...it may be proved, that FE makes right angles with every straight line which meets it in that plane: but a straight line is at right angles to a plane when it makes right angles with every straight line which meets it in that plane;* therefore EF is at right angles to the plane in...
Full view - About this book

Elements of geometry: consisting of the first four,and the sixth, books of ...

Euclides - History - 1842
...it may be proved that FE makes right angles with every straight line which meets it in that plane. But a straight line is at right angles to a plane, when it makes right angles with every straight line which meets it in that plane (1. Dcf. PI.) : therefore EF is at right angles to...
Full view - About this book

Elements of geometry: containing the first six books of Euclid, with a ...

John Playfair - Mathematics - 1842 - 317 pages
...SUPPLEMENT. BOOK II. OF THE INTERSECTION OF PLANES. DEFINITIONS. * 1. A STRAIGHT line is perpendicular or at right angles to a plane, when it makes right angles with every straight line which it meets in that plane. 2. A plane is perpendicular to a plane, when the...
Full view - About this book

Euclid in Paragraphs: The Elements of Euclid: Containing the First Six Books ...

Euclides - Geometry - 1845 - 199 pages
...it may be proved, that FE makes right angles with every straight line which meets it in that plane. But a straight line is at right angles to a plane when it makes right angles with every straight line which meets I! 3Det is. it in that plane ||: therefore EF is at right angles to...
Full view - About this book

Euclid's Elements of geometry [book 1-6, 11,12] with explanatory notes ...

Euclides - 1845
...it may be proved, that FE makes right angles with every straight line which meets it in that plane. But a straight line is at right angles to a plane when it makes right angles with every straight line which meets it in that plane : (xi. def. 3.) therefore EF is at right angles to...
Full view - About this book

A system of practical mathematics; being no.xvi. of a new series of school-books

Scottish school-book assoc - History - 1845
...thickness. II. The boundaries of a solid are superficies. III. A straight line is perpendicular, or at right angles to a plane, when it makes right angles with every line which meets it in that plane. IV. A plane is perpendicular to a plane, when the straight...
Full view - About this book

The Elements of Euclid, the parts read in the University of Cambridge [book ...

Euclides - 1846
...thickness. n. That which bounds a solid is a superficies. in. A straight line is perpendicular, or at right angles, to a plane, when it makes right angles with every straight line meeting it in that plane. iv. A plane is perpendicular to a plane, when the straight...
Full view - About this book

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

Euclid, John Playfair - Euclid's Elements - 1846 - 317 pages
...SUPPLEMENT. BOOK II. OF THE INTERSECTION OF PLANES. DEFINITIONS. 1. A STRAIGHT line is perpendicular or at right angles to a plane, when it makes right angles with every straight line which it meets in that plane. 2. 'A plane is perpendicular to a plane, when the...
Full view - About this book

An elementary course of mathematics

Samuel Hunter Christie - 1847
...it may be proved, that FE makes right angles with every straight line which meets it in that plane. But a straight line is at right angles to a plane when it makes right angles with every straight line which meets it in that plane (Def. 3): therefore EF is at right angles to the plane...
Full view - About this book

The definitions, postulates, axioms, and enunciations of the propositions of ...

Euclides - 1848
...thickness. II. That which bounds a solid is a superficies. III. A straight line is perpendicular, or at right angles, to a plane, when it makes right angles with every straight line meeting it in that plane. IV. A plane is perpendicular to a plane, when the straight...
Full view - About this book




  1. My library
  2. Help
  3. Advanced Book Search
  4. Download PDF