 A straight line is said to be perpendicular to a plane when it is perpendicular to every straight line which passes through its foot in that plane, and the plane is said to be perpendicular to the line.  Elementary Course of Geometry ... - Pàgina 1per Charles William Hackley - 1847 - 103 pàginesVisualització completa - Sobre aquest llibre
 | Hugo Reid - 1874 - 276 pàgines
...7, AB is perpendicular to CD :— also DB and CB are, each of them, perpendicular to A B. ( B~ 58. A straight line is said to be perpendicular to a plane, when it is perpendicular to every straight line drawn on that plane which it meets. 59. An Obtuse Angle is one which is greater,... | |
 | Charles Scott Venable - 1881 - 380 pàgines
...figure. This figure is usually a parallelogram in the Theorems of this Book. 2. A straight line is perpendicular to a plane when it is perpendicular to all the straight lines which pass through its foot in the plane. Conversely, the plane is perpendicular to the line. \ * The... | |
 | James Maurice Wilson - 1885 - 180 pàgines
...any two points being taken, the straight line which joins them lies wholly in that surface. Def. 2. A straight line is said to be perpendicular to a plane when it is perpendicular to every straight line in that plane. It is also said to be normal to the plane. Def. 3. A straight line... | |
 | Webster Wells - 1886 - 166 pàgines
...419. If a straight line meets a plane, the point of intersection is called the foot of the line. 420. A straight line is said to be perpendicular to a plane when it is perpendicular to every straight line drawn in the plane through its foot. 421. A straight line is said to be parallel... | |
 | Wooster Woodruff Beman, David Eugene Smith - 1895 - 344 pàgines
...congruence 5. .'. A BOP ^ A BOP'. I, th. 12 6. .'. Z. POB is a rt. Z, and w _L y. Why ? DEFINITIONS. A line is said to be perpendicular to a plane when it is perpendicular to every line in that plane which passes through its foot, that is the point where it meets the plane.... | |
 | Wooster Woodruff Beman, David Eugene Smith - 1895 - 346 pàgines
...congruence 5. .'. A BOP *= A BOP'. I, th. 12 6. .'. /_ POB is a rt. /_, and w _L y. Why ? DEFINITIONS. A line is said to be perpendicular to a plane when it is perpendicular to every line in that plane which passes through its foot, that is the point where it meets the plane.... | |
 | Webster Wells - 1899 - 180 pàgines
...397. Defs. If a straight line meets a plane, the point of intersection is called the foot of the line. A straight line is said to be perpendicular to a plane when it is perpendicular to every straight line drawn in the plane through its foot. A straight line is said to be parallel to... | |
 | Seymour Eaton - 1899 - 362 pàgines
...the following definitions : 141 plane EFGH. The floor and the ceiling of a room are parallel planes. A straight line is said to be perpendicular to a plane when it makes right angles with every straight line which meets it in that plane. The student will readily... | |
 | Wooster Woodruff Beman, David Eugene Smith - 1900 - 160 pàgines
...folding A ACP over AC as an axis, it can be brought to coincide with A A CP'. § 57 339. Definitions. A line is said to be perpendicular to a plane when it is perpendicular to every line in that plane which passes through its foot, — ie the point where it meets the plane.... | |
 | Wooster Woodruff Beman, David Eugene Smith - 1903 - 158 pàgines
...folding A ACP over AC as an axis, it can be brought to coincide with A A CP'. § 57 339. Definitions. A line is said to be perpendicular to a plane when it is perpendicular to every line in that plane which passes through its foot, — ie the point where it meets the plane.... | |
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