| Adrien Marie Legendre - Geometry - 1822 - 367 pages
...angle must be nothing. Still less can a triangle have more than one obtuse angle. Cor. 4. In every **right-angled triangle, the sum of the two acute angles is equal to** one right angle. Cor. 5. Since every equilateral triangle (Prop. 12.) is also equiangular, eacb of... | |
| John Playfair - Euclid's Elements - 1835 - 316 pages
...third angle must be nothing. Still less can a triangle have more than one right angle. COR. 4. In every **right-angled triangle, the sum of the two acute angles is equal to** one right angle. COR. 5. Since every equilateral triangle (Cor. 3. 1.) is also equiangular, each of... | |
| John Playfair - Geometry - 1837 - 318 pages
...angle must be nothing. Still less can a triangle have more than one obtuse angle. COR. 6. In every **right-angled triangle, the sum of the two acute angles is equal to** one right angle. COR. 7. Since every equilateral triangle (Cor. 5. 1.) is also equiangular, each of... | |
| John Joseph Griffin - Crystallography - 1841 - 489 pages
...triangle is $ of two right angles, or J of one right angle, and therefore contains 60°.— j. In every **right-angled triangle, the sum of the two acute angles is equal to** one right angle, and therefore contains 90°. — / , In every isosceles right-angled triangle, each... | |
| John Joseph Griffin - Crystallography - 1841 - 489 pages
...triangle is $ of two right angles, or Î of one right angle, and therefore contains 60°.— -j, In every **right-angled triangle, the sum of the two acute angles is equal to** one right angle, and therefore contains 90°. — t, In every isosceles right-angled triangle, each... | |
| John Playfair - Euclid's Elements - 1842 - 317 pages
...angle must be nothing. Still less can a triangle have more than one obtuse angle. COR. 6. In every **right-angled triangle, the sum of the two acute angles is equal to** one right angle. COR. 7. Since every equilateral triangle (Cor. 5. 1.) is also equiangular, each of... | |
| James Bates Thomson - Geometry - 1844 - 237 pages
...third angles will also be equal, and the two triangles will be mutually equiangular. Cor. 4. In every **right-angled triangle, the sum of the two acute angles is equal to** one right-angle. Cor. 5. Since every equilateral triangle, is also equiangular, (Prop. 11. Cor.,) each... | |
| Nicholas Tillinghast - Geometry, Plane - 1844 - 108 pages
...be but one right angle ; for if there could be two, the third angle would be nothing. Cor. 4. In a **right-angled triangle the sum of the two acute angles is equal to** one right angle. PROP. XIII. THEOREM. In any polygon, the sum of all the angles is equal to as many... | |
| John Playfair - Euclid's Elements - 1846 - 332 pages
...angle must be nothing. Still less can a triangle have more than one obtuse angle. COR. 6. In every **right-angled triangle, the sum of the two acute angles is equal to** one right angle. COR. 7. Since every equilateral triangle (Cor. 5. 1.) is also equiangular, each of... | |
| Elias Loomis - Conic sections - 1849 - 252 pages
...third angle would be nothing. Still less can a triangle have more than one obtuse angle. Cor. 4. In a **right-angled triangle, the sum of the two acute angles is equal to** one right angle. Cor. 5. In an equilateral triangle, each of the angles is one third of two right angles,... | |
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