Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Books Books
" The measure of an exterior angle of a triangle is equal to the sum of the measures of the two remote interior angles. "
Plane Geometry - Page 42
by Edward Rutledge Robbins - 1906 - 254 pages
Full view - About this book

A Treatise on Special Or Elementary Geometry

Edward Olney - Geometry - 1872 - 472 pages
...formed by any side with its adjacent side produced, as CBD, Fig. 174. PROPOSITION IT* 231. TJteorem. — An exterior angle of a triangle is equal to the sum of the two interior non-adjacent angles. DEM. — Let ABC be any triangle, and CBD an exterior angle;...
Full view - About this book

A Treatise on Special Or Elementary Geometry, Volumes 1-2

Edward Olney - Geometry - 1872 - 562 pages
...formed by any side with its adjacent side produced, as CBD, Fig. 174. PROPOSITION IT. 231. TJieorem. — An exterior angle of a triangle is equal to the sum of the two interior non-adjacent angles. DEM. — Let ABC be any triangle, and CBD an exterior angle;...
Full view - About this book

The elements of geometry, in eight books; or, First step in applied logic

L J V. Gerard - 1874 - 428 pages
...ABC [II. 21]: therefore the three angles are together equal to two right angles, WWTBD COROLLARY I. An exterior angle of a triangle, is equal to the sum of the two oppositeinterior angles. COROLLARY II. If two angles of a triangle be equal to two angles of...
Full view - About this book

A Treatise on Special Or Elementary Geometry

Edward Olney - Geometry - 1877 - 272 pages
...an angle formed by any side with its adjacent side produced, as CBD, Fig. 174. PROPOSITION IV. 231. Theorem. — An exterior angle of a triangle is equal to the sum of the two interior non-adjacent angles. . 174. DEM. — Let ABC be any triangle, and CBD an exterior...
Full view - About this book

Essentials of Geometry

Alfred Hix Welsh - Geometry - 1883 - 326 pages
...degrees in each of the others, and what is the kind of triangle ? 4. Prove that the exterior angle, BCE, of a triangle is equal to the sum of the opposite interior angles a and b. 5. If the opposite interior angles of a triangle are 35° 25', 68° 35', what is the exterior...
Full view - About this book

The New Physics: A Manual of Experimental Study for High Schools and ...

John Trowbridge - Physics - 1884 - 408 pages
...obtained very simply by geometry. The propositions necessary to prove it are the following: 1. The exterior angle of a triangle is equal to the sum of the opposite interior angles. 2. Two angles are equal when their sides are mutually perpendicular. 3. The sine of an acute angle...
Full view - About this book

Wentworth & Hill's Exercise Manuals: Geometry, Issue 3

George Albert Wentworth - 1884 - 264 pages
...also equal. 31. Corollary II. The sum of the acute angles of a right triangle is equal to 90°. 32. Theorem. An exterior angle of a triangle is equal to the sum of the two opposite interior angles. 33. Theorem. The sum of the angles of a quadrilateral is equal to...
Full view - About this book

The Elements of Geometry

George Bruce Halsted - Geometry - 1885 - 389 pages
...half 2^ at center standing on (arc BC + arc DA). PROOF. Join CD. £ BFC = £ BDC + £ DCA. (173. The exterior angle of a triangle is equal to the sum of the opposite interior angles.) But 2 4 BDC = £ at center on BC, and 2 £ DCA = £ at center on DA ; (375. An angle at the center...
Full view - About this book

The Elements of Geometry

George Bruce Halsted - Geometry - 1886 - 394 pages
...= half 4 at center standing on (arc BC + arc DA). PROOF. Join CD. 4 BFC = 4 BDC + 4 DCA. (173. The exterior angle of a triangle is equal to the sum of the opposite interior angles.) But 2 4 BDC = 4 at center on BC, and 2 4 DCA = 4 at center on DA ; (375- An angle at the center is...
Full view - About this book

A Primary Geometry: With Simple and Practical Examples in Plane and ...

Samuel Edward Warren - Geometrical drawing - 1887 - 200 pages
...d, e, /, Fig. 52, are exterior angles. The last theorem now naturally leads to the following : — Theorem. — An exterior angle of a triangle is equal to the sum of the two opposite interior angles. The angles d and CAB, Fig. 53, arc together equal to two right angles,...
Full view - About this book




  1. My library
  2. Help
  3. Advanced Book Search
  4. Download EPUB
  5. Download PDF