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If two planes are perpendicular to 'each other, a straight line drawn in one of them, perpendicular to their intersection, will be perpendicular to the other.
Elements of Geometry and Trigonometry: From the Works of A.M. Legendre - Page 172
by Adrien Marie Legendre - 1874 - 455 pages

## Elements of Geometry and Trigonometry from the Works of A.M. Legendre ...

Charles Davies - Geometry - 1872 - 464 pages
...other. PROPOSITION XVII. THEOREM. If two planes are perpendicular to each other, a straight lint draiKn in one of them, perpendicular to their intersection,...perpendicular to each other, and let the line AP, drawn b the plane BF, be perpendicular to the intersection BC ; then will AP be perpendicular to the plane...

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

William Chauvenet - Mathematics - 1872 - 382 pages
...other two, and the three planes are perpendicular to each other. 7 PROPOSITION XVIII.— THEOREM. 49. If two planes are perpendicular to each other, a straight...one of them, perpendicular to their intersection, is perpendicular to the other. Let the planes PQ and MN be perpendicular to each other; and at any...

## Elements Of Geometry And Trigonometry

Charles Davies - 1874 - 464 pages
...each other. PROPOSITION XVII. THEOREM. If two planes are perpendicular to each other, a straight lint drawn in one of them, perpendicular to their intersection,...each other, and let the line AP, drawn in the plane BF, be perpendicular to the intersection BC ; then will AP be perpendicular to the plane MN. BOOK VI....

## Annual Statement, Volumes 11-20

1876 - 646 pages
...construct a triangle equivalent to a given polygon. 2. To inscribe a regular decagon in a given circle. 3. If two planes are perpendicular to each other, a straight...in one of them perpendicular to their intersection is perpendicular to the other. 4. Define a polyhedron and a prism. The sections of a prism made by...

## Elements of Geometry with Exercises for Students: An an Introduction to ...

Aaron Schuyler - Geometry - 1876 - 384 pages
...one of its points to the given plane, is perpendicular to that plane (363). 365. Proposition XX.— Theorem. If two planes are perpendicular to each other, a straight line in one, perpendicular to their intersection, is perpendicular to the other. • Let the planes, MN,...

## Elements of Plane and Solid Geometry

George Albert Wentworth - Geometry - 1877 - 416 pages
...is a right dihedral, , J. to MN. QED SOLID ANGLES. PROPOSITION XVII. THEOREM. 473. If two planes be perpendicular to each other, a straight line drawn...in one of them perpendicular to their intersection is perpendicular to the other plane. M A IB — - C the planes MN and PQ be perpendicular to each other,...

## Elements of Plane and Solid Geometry

George Albert Wentworth - Geometry - 1882 - 442 pages
...j,toMJy. QED SOLID ANGLES. 271 PROPOSITION XVII. THEOREM. 473. If two planes be perpendieular to cach other, a straight line drawn in one of them perpendicular to their intersection is perpendicular to the other plane. M ß~ -c l the planes MN and PQ be perpendicular to each other,...

## Elements of Plane and Solid Geometry

George Albert Wentworth - Geometry - 1884 - 422 pages
...right dihedral, .\PQia±ieoMN. QED SOLID ANGI.ES. PROPOSITION XVII. THEOREM. 473. If two planes be perpendicular to each other, a straight line drawn in one of them perpendicular tu their intersection is perpendicular to the other plane. M с í<et the planes MN and PQ be perpendicular...