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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.
A Course of Mathematics: In Two Volumes. For the Use of Academies, as Well ... - Page 306
by Charles Hutton - 1818

## Elements of Geometry: With Practical Applications to Mensuration

Benjamin Greenleaf - Geometry - 1863 - 506 pages
...English mathematician. BOOK VII. PLANES. — DIEDRAL AND POLYEDRAL ANGLES. DEFINITIONS. 388. A STRAIGHT line is perpendicular to a plane, when it is perpendicular to every straight line which it meets in that plane. Conversely, the plane, in the same case, is perpendicular...

## Elements of Geometry: With Practical Applications to Mensuration

Benjamin Greenleaf - Geometry - 1868 - 338 pages
...English mathematician. BOOK VII. PLANES. — DIEDRAL AND P0LYEDRAL ANGLES. DEFINITIONS. 388. A STRAIGHT line is perpendicular to a plane, when it is perpendicular to every straight line which it meets in that plane. Conversely, the plane, in the same case, is perpendicular...

## Elements of Geometry, Conic Sections, and Plane Trigonometry

Elias Loomis - Geometry - 1871 - 302 pages
...-•'£ u•iKOMKTKV. 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. Converse!) , the plane in this case is per pendicular to...

## A Treatise on Elementary Geometry: With Appendices Containing a Collection ...

William Chauvenet - Geometry - 1871 - 380 pages
...can contain three such points. PERPENDICULARS AND OBLIQUE LINES TO PLANES. 6. Definition. A straight line is perpendicular to a plane when it is perpendicular to every straight line drawn in the plane through its foot, that is, through the point in which it meets the...

## Elements of Geometry and Trigonometry

Adrien Marie Legendre - Geometry - 1871 - 492 pages
...the diameter to the circumference. BOOK VI. PLANES AND POLYEDRAL ANGLES . DEFINITIONS. 1. A straight line is PERPENDICULAR TO A PLANE, when it is perpendicular to every straight line of the plane which passes through its FOOT; that is, through the point in which it meets...

## An Elementary Geometry and Trigonometry

William Frothingham Bradbury - Geometry - 1872 - 256 pages
...other two sides. (68.) BOOK IV. GEOMETRY OF SPACE. 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. Conversely, the plane, in this case, is perpendicular to...

## A Treatise on Elementary Geometry: With Appendices Containing a Collection ...

William Chauvenet - Geometry - 1872 - 382 pages
...can contain three such points. PERPENDICULARS AND OBLIQUE LINES TO PLANES. 6. Definition. A straight line is perpendicular to a plane when it is perpendicular to every straight line drawn in the plane through its foot, that is, through the point in which it meets the...

## An Elementary Geometry

William Frothingham Bradbury - Geometry - 1872 - 124 pages
...B. (23.) (II. 25.) BOOK IV. GEOMETRY OE SPACE. 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. Conversely, the plane, in this case, is perpendicular to...

## New Elementary Geometry: With Practical Applications ; a Shorter Course Upon ...

Benjamin Greenleaf - Geometry - 1873 - 202 pages
...similar polygon within the same circle. 10 BOOK V.* PLANES AND POLYEDRONS. DEFINITIONS. M250. A straight line is perpendicular to a plane, when it is perpendicular to every straight line which it meets in that plane. Conversely, the plane, in the same case, is perpendicular...

## New Elementary Geometry: With Practical Applications : a Shorter Course Upon ...

Benjamin Greenleaf - Geometry - 1874 - 206 pages
...similar olygon within the same circle. 10 BOOK V,* PLANES AND POLYEDRONS. DEFINITIONS. M 250. A straight line is perpendicular to a plane, when it is perpendicular to every straight line which it meets in that plane. Conversely, the plane, in the same case, is 2>crpei><li>:iil<ir...