| Olinthus Gregory - Mathematics - 1834 - 480 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 - 235 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 - 896 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 - 150 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 - 308 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 - 236 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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