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 279by Euclid, Sir Thomas Little Heath, Johan Ludvig Heiberg - 1908Full view - About this book
| Robert Simson, Euclid - Trigonometry - 1762 - 466 pages
...proved that FE makes right angles with every ftraight line which meets it in that plane. But a ftraight **line is at right angles to a plane when it makes right angles with** every ftrajght line which meets it in that plane f. therefore EFf. 3. Def. i<. is at right angles to... | |
| Robert Simson, Euclid - Trigonometry - 1775 - 520 pages
...thickneft. II. That which bounds a fblid is a fuperficies. 111. A ftraight line is perpendicular, or **at right angles to a plane, when it makes right angles with** every ftraight line meeting it in that plane. IV. A plane is perpendicular to a plane, when the ftraight... | |
| Euclid - 1781 - 520 pages
...proved, that FE makes right angles with every ftraight line which meets it in that plane. But a ftraight **line is at right angles to a plane when it makes right angles with** every ftraight line which meets it in that plane f : Therefore EF is at right angles to the plane f... | |
| John Playfair - Euclid's Elements - 1795 - 400 pages
...therefore it makes right angles with every ftraight line which meets it in that plane. But a ftraight **line is at right angles to a plane when it makes right angles with** every ftraight line which meets it in that.plane f : therefore EK is at right an.-V f i.3 to the plane... | |
| Trigonometry - 1799 - 351 pages
...angles with every ftraight line which meets it in the plane paffing through AB, CD. But a ftraight **line is at right angles to a plane when it makes right angles with** every ftraight fj.Def.ir. line which meets it in that plane i : Therefore EF is at right angles to... | |
| Robert Simson - Trigonometry - 1804
...proved that FE makes right angles with every ftraight line which meets it in that plane. But a ftraight **line is at right angles to a plane when it makes right angles with** every ftraight line which meets it in that plane f. therefore EF fs-Def.n. is at right angles to the... | |
| John Playfair - Euclid's Elements - 1804 - 440 pages
...• BOOK II. OF THE INTERSECTIoN oF PLANES. I 4 .DEFINITIONS. I. A STRAIGHT line is perpendicular, or **at right angles to a plane, when it makes right angles with** every ftraight * line, in that plane, which it meets. II. A plane is perpendicular to a plane, when... | |
| Euclid, Robert Simson - Euclid's Elements - 1806 - 518 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 it in that plane f : therefore EF is at right an- f 3. def. gles to... | |
| John Mason Good, Olinthus Gilbert Gregory - 1813
...and thickness. 2. That which bounds a solid is a superficies. 3. 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. 4. A plane is perpendicular to a plane, »hen the straight... | |
| Euclides - 1816 - 528 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 it in that planefi: Therefore EF is at right .3 Def.i1. angles to the... | |
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