| Walter Percy Workman - 1880 - 248 pages
...the angle BFA is equal to the difference between two right angles and twice the angle ACB ; because **the three angles of a triangle are together equal to two right angles.** [i. 32. By precisely similar reasoning it may be shown that AEC is equal to the difference between... | |
| Isaac Todhunter - 1880 - 426 pages
...equilateral ; therefore the three angles EGD, GDE, DEG are equal to one another. [I. 5. Corollary. But **the three angles of a triangle are together equal to two right angles;** [I. 32. therefore the angle EGD is the third part of two right [Axiom 1. In the samp manner it may... | |
| Henry Angel - 1880 - 360 pages
...When it equals that angle, the plane containing them is perpendicular to the hp This is obvious, as **the three angles of a triangle are together equal to two right angles,** and the lines have their greatest inclinations when they are contained by a vertical plane. The angle... | |
| Henry Angel - 1880 - 362 pages
...When it equals that angle, the plane containing them is perpendicular to the hp This is obvious, as **the three angles of a triangle are together equal to two right angles,** and the lines have their greatest inclinations when they are contained by a vertical plane. The angle... | |
| Samuel Earnshaw - 1881 - 602 pages
...we shall see that the further progress of mathematics was indirectly to a very great extent due. b. **The three angles of a triangle are together equal to two right angles.** Eudemus, according to a statement of Proclus on Euclid i. 32, ascribes the discovery of this theorem... | |
| Charles Taylor - 1881 - 512 pages
...we shall see that the further progress of mathematics was indirectly to a very great extent due. i. **The three angles of a triangle are together equal to two right angles.** Eudemus, according to a statement of Proclus on Euclid I. 32, ascribes the discovery of this theorem... | |
| J. L. Robinson - 1882 - 356 pages
...geometrical theorems must be known : (1) The angles at the base of an isosceles triangle are equal. (2) **The three angles of a triangle are together equal to two right angles.** (3) The angle at the centre of a circle is double the angle at the circumference standing on an equal... | |
| James McCosh - 1882 - 472 pages
...inhabited, even this is not a primary conviction ; we believe it because of secondary testimony. Nay, that **the three angles of a triangle are together equal to two right angles,** is not a primitive judgment, for it needs other truths coming between to carry our conviction. X But... | |
| Masonic monthly - 1882 - 398 pages
...harmony. The ! I or double square, by its diagonal right line, is bisected into two triangles ; and as **the three angles of a triangle are together equal to two right angles,** so must the right line forming the hypothenuse of a right-angled triangle t^ be of a value double to... | |
| Euclid, Isaac Todhunter - 1883 - 428 pages
...equilateral ; therefore the three angles EGD, GDE, DEG are equal to one another. [I. 5. Corollary. But **the three angles of a triangle are together equal to two right angles** ; [I. 32. therefore the angle EGD is the third part of two right angles. In the same manner it may... | |
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