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Any two sides of a triangle are together greater than the third side.
Euclid's Elements of Geometry - Page 59
edited by - 1893 - 504 pages

## Space, Time and Gravitation: An Outline of the General Relativity Theory

Sir Arthur Stanley Eddington - Gravitation - 1923 - 242 pages
...true geometry? Phys. Yes. Our experimental work proves it true. Rel. How, for example, do you prove that any two sides of a triangle are together greater than the third side? Phys. I can, of course, only prove it by taking a very large number of typical cases, and I am limited...

## Plane Geometry

Walter Burton Ford, Charles Ammermann - Geometry, Modern - 1923 - 406 pages
...meet at the point D within the triangle, and if AB > AC, prove that DB > DC. 40. Prove that the sum of any two sides of a triangle are together greater than the third side. [HiNT. Given the A ABC. To prove AB + AC > BC. Proof. Prolong BA to D making AD = AC. Join D to C....

## Plane and Solid Geometry

Walter Burton Ford, Charles Ammerman - Geometry, Plane - 1923 - 414 pages
...meet at the point D within the triangle, and if AB > AC, prove that DB > DC. 40. Prove that the sum of any two sides of a triangle are together greater than the third side. [HINT. Given the A ABC. To prove AB + AC > BC. Proof. Prolong BA to D making AD = AC. Join D to C....

## Theoretical Geometry: Based on the Various Geometry Books by Godfrey and Siddons

Arthur Warry Siddons, Reginald Thomas Hughes - Geometry - 1926 - 202 pages
...angles of a triangle are unequal, the greater angle has the greater side opposite to it 36 ^THEOREM 18. Any two sides of a triangle are together greater than the third side 37 THEOREM 19. Of all the straight lines that can be drawn to a given straight line from a given point...

## The Analysis of Matter

Bertrand Russell - Matter - 1927 - 444 pages
...between B and C is zero, but that between A and C may have any time-like magnitude. Euclid proved that two sides of a triangle are together greater than the third side, and was criticized on the ground that this proposition was evident even to asses. But in relativity...

## Studies and Exercises in Formal Logic: Including a Generalisation of Logical ...

John Neville Keynes - Logic - 1928 - 580 pages
...ordinary formal logic, the two propositions, Every angle in a semi-circle is equal to a right angle, Any two sides of a triangle are together greater than the third side, may be considered to be identical in form. Each is universal, and each is affirmative ; they differ...

## Educational Review, Volume 6

Nicholas Murray Butler, Frank Pierrepont Graves, William McAndrew - Education - 1893 - 554 pages
...already proved. Euclid demonstrates things more axiomatic by far. He demonstrates what every dog knows, that any two sides of a triangle are together greater than the third. Yet after he has finished his demonstration, that straight lines making with a transversal equal alternate...

## Educational Review, Volume 6

Education - 1893 - 562 pages
...already proved. Euclid demonstrates things more axiomatic by far. He demonstrates what every dog knows, that any two sides of a triangle are together greater than the third. Yet after he has finished his demonstration, that straight lines making with a transversal equal alternate...