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
| William Somerville Orr - Science - 1854
...in space. MATHEMATICAL SCIENCES.— No. VIII. DEFINITIONS. I. A straight line is perpendicular, or **at right angles to a plane, when it makes right angles with** every straight line in that plane which meets it. Thus, if BD he a plane, PA a line perpendicular to... | |
| Euclides - 1855
...may be proved, that FE makes right angles with every other straight line meeting it in that plane. **But a straight line is at right angles to a plane when it makes right angles with** every straight line meeting it in that plane (XI. Def. 3). Therefore EF is at right angles to the plane... | |
| Euclides - 1855
...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... | |
| Eucleides - 1860
...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... | |
| Robert Potts - 1864
...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. :5.) therefore EF is at right angles to... | |
| Robert Potts - 1865 - 504 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 meete it in that plane : (xi. def. 3.) therefore EF is at right angles to... | |
| Alexander Kennedy Isbister - 1865
...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... | |
| Euclid, Isaac Todhunter - Geometry - 1867 - 400 pages
...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, when the straight... | |
| Isaac Todhunter - Euclid's Elements - 1867 - 400 pages
...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 iu that plane. 4. A plane is perpendicular to a plane, when the straight... | |
| 1868 - 410 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 : (xI. def. 3.) therefore EF is at right angles to... | |
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