 | Robert Simson - 1762 - 488 sider
...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 the... | |
 | Robert Simson - 1775 - 534 sider
...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 - 552 sider
...and thicknefs, That which bounds a folid is a uoerficies. Ill A ftraight line is perpendicular, or at right angles to a plane, when it makes right angles with every itraight line meeting it in that plane. IV. A plane is perpendicular to a plane, when the ftraight... | |
 | Euclid, John Playfair - 1795 - 462 sider
...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 in... | |
 | Alexander Ingram - 1799 - 374 sider
...thicknefs. >^ n. That which bounds a folid is a fuperficies. III. 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... | |
 | Robert Simson - 1804 - 530 sider
...thicknefs. II. That which bounds a folid is a fupcrficies. III. 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... | |
 | John Mason Good - 1813 - 714 sider
...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 - 588 sider
...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... | |
 | John Playfair - 1819 - 354 sider
...SUPPLEMENT. BOOK II. I OF THE INTERSECTION OF PLANES. DEFINITIONS. I. 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. II. A plane is perpendicular to a plane, when the straight... | |
 | Abraham Rees - 1819 - 754 sider
...2. The exterior furface of a folid is called its fuperficiee, 3 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. 4. A plane is perpendicular to a plane, when the ftraight lines... | |
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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... 
