| Geography - 1867 - 964 pages
...в together make up the angle r> с в, which is therefore equal to the angles с в А, в A c. 7. **The three interior angles of every triangle are together equal to two right** anglet. In Fig. 5 the angle BCD has been shown to be equal to the angles с в А, в А с ; to each... | |
| William Enfield, Johann Jakob Brucker - Early works to 1800 - 1791 - 610 pages
...four. Of the geometrical theorems afcribed to Pythagoras, the following are the principal; that the **interior angles of every triangle are together equal to two right angles;** that the only polygons which will fill up the whole fpace about a given point, are the equilateral... | |
| John Aikin - Biography - 1813 - 720 pages
...four. Of the geometrical theorems ascribed to Pythagoras, the following are the principal : that the **interior angles of every triangle are together equal to two right angles** ; that the only polygons which will fill up the whole space about a given point, are the equilateral... | |
| William Enfield - Philosophy - 1819 - 540 pages
...1. xiv. c, 33. "Boeth. deMus. 1. iv. c. 14. Pythagorjis, the following are the principal : that the **interior angles of every triangle are together equal to two right angles** ; that the only polygons Which will fill up the whole space about a given point, are the equilateral... | |
| Anthony Nesbit, W. Little - Measurement - 1822 - 916 pages
...produced to D ; the exterior angle ACD is equal to the two interior and opposite angles CAB, ABC; also **the three interior angles of every triangle are together equal to two right angles.** (Em. I. 32. Simp. I. 9, 10. Em. IL I, 2 J A C THEOREM V. Let the parallelograms ABCD, DBCEbe upon the... | |
| Thomas Perronet Thompson - Euclid's Elements - 1833 - 150 pages
...And by parity of reasoning, the like may be proved in every other instance. Wherefore, universally, **if the square described on one of the sides of a triangle,** &c. Which was to be demonstrated. END OF THE FIRST BOOK. NOTES, FAMILIAR AND GEOMETRICAL. NOMENCLATURE... | |
| John Fellows - Druids and druidism - 1835 - 432 pages
...four. Of the geometrical theorems ascribed to Pythagoras, the following are the principal: that the **interior angles of every triangle are together equal to two right angles;** that the only polygons which fill up the whole space about a given point, are the equilateral triangle,... | |
| Euclid - Geometry - 1837 - 410 pages
...of any triangle be produced, the exterior angle is equal to the two interior and remote angles ; and **the three interior angles of every triangle are together equal to two right angles.** Let the side BC of the triangle ABC be produced to D : the exterior angle A CD is equal to the two... | |
| Charles Reiner - Geometry - 1837 - 246 pages
...SUBSTANCE OF SECTION III. 1. Any two angles of a triangle are together less than two right angles. 2. The **interior angles of every triangle are together equal to two right angles.** 3. A right-angled triangle is that which has a right angle. 5. An acute-angled triangle is that which... | |
| Scotland free church, gen. assembly - 1847 - 552 pages
...FIRST CLASS-GEOMETRY. 1. The greater side of every triangle has the greater angle opposite to it. 2. **The three interior angles of every triangle are together equal to two right angles.** 3. Parallelograms upon equal bases, and between the same parallels, are equal. 4. If a straight line... | |
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