 | Olinthus Gregory - Mathematics - 1834 - 484 pages
...is perpendicular to a plane, when it is perpendicular to every line in that plane which meets it 3. One plane is perpendicular to another, when every...their common section, is perpendicular to the other. 4. The inclination of one plane to another, or the angle they form between them, is the angle contained... | |
 | Industrial arts - 1835 - 398 pages
...AND SOLIDS. 1. The Common Section of two Planes is the line in which they meet or cut each other. 2. A Line is Perpendicular to a Plane, when it is perpendicular to every line in that plane which meets it. 3. One Plane is Perpendicular to another, when every line of the one which is perpendicular to the... | |
 | Adrien Marie Legendre - Geometry - 1841 - 288 pages
...same perimeter. PART SECOND. SECTION FIRST. Of Planes and Solid AnglesDEFINITIONS. 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,... | |
 | Benjamin Peirce - Geometry - 1841 - 186 pages
...angle CAD is a right angle, the planes are perpendicular to each other. 317. Definitions. A straight line is perpendicular to a plane, when it is perpendicular 'to every straight line drawn through its foot in the plane. • Line Perpendicular to a Plane. Reciprocally,... | |
 | Nathan Scholfield - 1845 - 894 pages
...DEFINITIONS. 1. THE common section of two planes, is the line in which they meet to cut each other. 2. A line is perpendicular to a plane when it is perpendicular to every line in that plane which meets it. 3. One plane is perpendicular to another, when every line of the one which is perpendicular to the... | |
 | Benjamin Peirce - Geometry - 1847 - 204 pages
...angle CAD is a right angle, the planes are perpendicular to each other. 317. Definitions. A straight line is perpendicular to a plane, when it is perpendicular to every straight line drawn through its foot in the plane. Line Perpendicular to a Plane. Reciprocally, the... | |
 | George Roberts Perkins - Geometry - 1847 - 326 pages
...SIXTHDEFINITIONS. 1. The common section of two planes is the line in which they meet to cut each other. 2. A line is perpendicular to a plane, when it is perpendicular to any two lines in that plane which meet it. 3. One plane is perpendicular to another, when every line... | |
 | Elias Loomis - Conic sections - 1849 - 252 pages
...signifies circumference. SOLID GEOMETRY, BOOK VII. PLANES AND SOLID ANGLES. Definitions. 1. A STRAIGHT line is perpendicular to a plane, when it is perpendicular to every straight line which it meets in that plane. The foot of the perpendicular, is the point in which it... | |
 | George Roberts Perkins - Geometry - 1850 - 332 pages
...DEFINITIONS. 1. THE intersection of two planes is the line in which they meet to cut each other. 2. A line is perpendicular to a plane, when it is perpendicular to all the lines in that plane which meet it. 3. One plane is perpendicular to another, when every line... | |
 | Charles Davies - Geometry - 1850 - 238 pages
...three to 120° x 3=360°. GEOMET R Y. BOOK V. OF PLANES AND THEIR ANGLES. DEFINITIONS. 1 . A straight line is perpendicular to a plane, when it is perpendicular to every straight line of the plane which it meets. The point -at which the perpendicular meets the plane, is... | |
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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. 
