 | Euclid - 1789 - 296 sider
...1. The common fection of two planes, is the line in which they meet, or cut each other. 2. A right line is perpendicular to a plane, when it is perpendicular to every right line which meets it in that plane. 3. A plane is perpendicular to a plane, when every right line... | |
 | Charles Hutton - 1812 - 620 sider
...DEF. 88. The Common Section of two Planes, is the line in which they meet, to cut each other. 89. A Line is Perpendicular to a Plane, when it is perpendicular to every line in that plane which meets it. 90. One Plane is Perpendicular to Another, when every line of the... | |
 | Charles Hutton - 1815 - 686 sider
...perpendicular to a curve, when it is perpendicular to the tanpent of the curve at the point of con- =, tact. A line is perpendicular to a plane, when it is perpendicular to every line drawn in the plane through the bottom of the perpendicular. And one plane is perpendicular to... | |
 | 1816 - 764 sider
...THE COMMON SECTION of two planes, is the line in which tht-r meet, or cut each other. 68. A ftraight line is PERPENDICULAR, to. a plane, when it is perpendicular to every line which meets it in that plane. 69. One plane is PERPENDICULAR to another, vhen every right line... | |
 | Adrien Marie Legendre - 1819 - 574 sider
...FIRST. '• ' . : .'•!. ..',•. - : V. -. '-.I Of planes and solid angles. .... . . 313. A 8TRAIGHT line is perpendicular to a plane, when it is perpendicular to every straight line in the plane which passes through the foot of the perpendicular (326). Reciprocally, the plane, in... | |
 | Pierre Simon marquis de Laplace, Thomas Young - 1821 - 402 sider
...and, the radius being unity, 1°=:.01 7453293, 1'=.000290888, and 1"=: .000004848. 145. DEFINITION. A straight line is perpendicular to a plane, when it is perpendicular to every straight line meeting it in that plane. 146. DEFINITION. A plane is perpendicular to a plane, when all the straight... | |
 | Adrien Marie Legendre - 1822 - 394 sider
...circle is greater than any isoperi metrical polygon. BOOK V. PLANKS AND SOLID ANGLES. Definitions. I. A straight line is perpendicular to a plane, when it is perpendicular to all the straight lines (4. IV.) which pass through its foot in the plane. Conversely, the plane is... | |
 | Charles Hutton - 1822 - 616 sider
...DEF. 88. The common Section of two Planes, is the line m which they meet, to cut each other. 89. A line is Perpendicular to a Plane, when it is perpendicular to every line in that plane which meets it. 90. One Plane is Perpendicular to Another, when every line of the... | |
 | Adrien Marie Legendre, John Farrar - 1825 - 280 sider
...polygon of the same perimeter. PART SECOND. SECTION FIRST. Of Planes and Solid Angles, DEFINITIONS. 313. A STRAIGHT line is perpendicular to a plane, when it is perpendicular to every straight line in the plane which passes through the foot of the perpendicular (326). Reciprocally, the plane, in... | |
 | Adrien Marie Legendre, John Farrar - 1825 - 294 sider
...polygon of the same perimeter. PART SECOND. SECTION FIRST. Of Planes and Solid Jingles. DEFINITIONS. 313. A STRAIGHT line is perpendicular to a plane, when it is perpendicular to every straight line in the plane which passes through the foot of the perpendicular (326). Reciprocally, the plane, in... | |
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A STRAIGHT line is perpendicular to a plane, when it is perpendicular to every straight line which it meets in that plane. 
