 | Adrien Marie Legendre - Geometry - 1822 - 394 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 - 336 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 - Euclid's Elements - 1837 - 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... | |
 | John Joseph Griffin - Crystallography - 1841 - 544 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 - 538 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 - 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... | |
 | James Bates Thomson - Geometry - 1844 - 268 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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... angles of another, the third angles will also be equal, and the two triangles will be mutually equiangular. Cor. 
