| Robert Simson - Trigonometry - 1762 - 466 pages
...to the two interior and oppofite angles ; and the three interior angles of every triangle are ec(ual **to two right angles. Let ABC be a triangle, and let one of its** fides BC be produced to D. the exterior angle ACD is equal to the two interior and oppofite angles... | |
| Geography - 1867
...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... | |
| Robert Simson - Trigonometry - 1775 - 520 pages
...equal to the two interior and oppofite angles ; and the three interior angles of every triangle are **equal to two right angles. Let ABC be a triangle, and let one of its** fides BC be produced to D ; the exterior angle ACD is equal to the two interior and oppofite angles... | |
| Euclid - 1781 - 550 pages
...equal to the two interior and oppofite angles ; and the three interior angles of every triangle are **equal to two right angles. Let ABC be a triangle, and let one of its** fides BC be produced to D ; the exterior angle ACD is equal to the two interior and oppofite angles... | |
| Robert Simson - Trigonometry - 1781 - 466 pages
...equal to the two interior and oppofite angles ; and the three interior angles of every triangle are **equal to two right angles. Let ABC be a triangle, and let one of its** fides BC be produced to D. the exterior angle ACD is equal to the two interior and oppofite angles... | |
| 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 Playfair - Euclid's Elements - 1795 - 444 pages
...equal to the two interior and oppofite angles ; and the three interior angles of every triangle are **equal to two right angles. Let ABC be a triangle, and let one of its** fides BC be produced to D ; the exterior angle ACD is equal to the two in- . terior and oppofite angles... | |
| Alexander Ingram - Trigonometry - 1799 - 351 pages
...equal to the two interior and oppoiite angles ; and the three interior angles of every triangle are **equal to two right angles. Let ABC be a triangle, and let one of its** fides BC be produced to D ; the exterior angle ACD is equal to the two interior and oppofite angles... | |
| Robert Simson - Trigonometry - 1804
...equal to the two interior and oppofite angles ; and the three interior angles of every triangle are **equal to two right angles. Let ABC be a triangle, and let one of its** fides BC be produced to D. the exterior angle ACD is equal to the two interior and oppofite angles... | |
| John Playfair - Euclid's Elements - 1806 - 311 pages
...equal to the two interior and opposite angles ; and the three interior angles of every triangle are **equal to two right angles. Let ABC be a triangle, and let one of its sides BC be produced to D** ; the exterior angle ACD is equal to the two interior and opposite angles CAB, ABC ; and the three... | |
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