Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Books Books
" After remarking that the mathematician positively knows that the sum of the three angles of a triangle is equal to two right angles... "
The New Practical Builder and Workman's Companion, Containing a Full Display ... - Page 28
by Peter Nicholson - 1823 - 596 pages
Full view - About this book

Appletons' Cyclopædia of Technical Drawing: Embracing the Principles of ...

William Ezra Worthen - Architectural drawing - 1892 - 850 pages
...angles at B are equal to the three angles of the triangle, and their sum is equal to two right angles. Therefore, the sum of the three angles of a triangle is equal to two right angles. On one side of a triangle (Fig. 50) construct a triangle equal to the first, with opposite...
Full view - About this book

Rousseau's Émile: Or, Treatise on Education

Jean-Jacques Rousseau - Education - 1892 - 424 pages
...of mathematical demonstration. No experimental process can ever establish the general truth that the sum of the three angles of a triangle is equal to two right angle?. We should not confound " geometrical recreations " with geometrical science.—(P.) f Isoperimetric...
Full view - About this book

Émile: Or, Treatise on Education

Jean-Jacques Rousseau - Education - 1892 - 424 pages
...of mathematieal demonstration. No experimental process can ever establish the general truth that the sum of the three angles of a triangle is equal to two right angles. We should not confound " geometrical recreations " with geometrical science. — (P.) f Isoperimetric...
Full view - About this book

The Elements of Solid Geometry

William C. Bartol - Geometry, Solid - 1893 - 106 pages
...lines cannot meet. 353. Any side of a triangle is less than the sum of the other two sides. 354. The sum of the three angles of a triangle is equal to two right angles. 355. Two triangles are equal in all respects when two sides and the included angle of the one...
Full view - About this book

Teachers' Manual for Teachers Using Arithmetic by Grades

John Tilden Prince - Arithmetic - 1894 - 254 pages
...point is equal to 360°. 6. The opposite angles made by two lines crossing each other are equal. 7. The sum of the three angles of a triangle is equal to two right angles. The sum of the angles of a polygon is equal to two right angles taken as many times as the...
Full view - About this book

Appletons' Popular Science Monthly, Volume 50

William Jay Youmans - Science - 1897 - 902 pages
...invention, and judgment" Instead of a series of written proofs to memorize, such as, for instance, the sum of the three angles of a triangle is equal to two right angles, the student takes the triangle, and, with suggestions from the teacher where necessary, works...
Full view - About this book

The Popular Science Monthly, Volume 12

Science - 1878 - 804 pages
...inferences. Locke explains it as follows: After remarking that the mathematician positively knows that the sum of the three angles of a triangle is equal to two right angles because he apprehends the geometrical proof, he thus continues : " But another man who never...
Full view - About this book

New Franklin Arithmetic, Book 2

Edwin Pliny Seaver, George Augustus Walton - Arithmetic - 1895 - 412 pages
...it out. Tear off C FIG. 24. two of the angles and place them, as in Fig. 24, so as to show that The sum of the three angles of a triangle is equal to two right angles. e. How many degrees are there in each angle of an equilateral triangle ? /. If the two acute...
Full view - About this book

Numerical Problems in Plane Geometry with Metric and Logarithmic Tables

Joe Garner Estill - Geometry - 1896 - 168 pages
...s= — g (Use logarithms.) Princeton, June, 1894. What text-book have you read ? 1. Prove that the sum of the three angles of a triangle is equal to two right angles. Define triangle, right angle, right triangle, scalene triangle. 3. Prove that an angle inscribed...
Full view - About this book

Syllabus of Geometry

George Albert Wentworth - Mathematics - 1896 - 68 pages
...triangle is greater than the third side, and their difference is less than the third side. 138. The sum of the three angles of a triangle is equal to two right angles. 139. Cor. 1. If the sum of two angles of a triangle is subtracted from two right angles, the...
Full view - About this book




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