| John Playfair - 1806 - 311 páginas
...one angle of a triangle be equal to the other two angles, it is a right angle. PROP. XXXII. THEOR. **IF a straight line touch a circle, and from the point of contact** a straight line be drawn cutting the circle, the angles -made by this line with the line which touches... | |
| Euclid - 1810 - 518 páginas
...FC is perpendicular to DE. Therefore, if a straight line, &c. QED C GE a 18. 3. ,' PROP. XIX. THEOR. **IF a straight line touch a circle, and from the point of contact** a straight line be drawn at right angles to the touching lirie, the centre of the circle shall be in... | |
| John Playfair - 1819 - 333 páginas
...DE ; FC is therefore perpendicular to DE. Therefore, if a straight line, &c. Q, ED PROP. XIX. THEOR. **If a straight line touch a circle, and from the point of contact** a straight line be drawn at right angles to the touching line, the centre of the circle, is in that... | |
| Robert Simson - 1827 - 513 páginas
...the same two ; and when the adjacent angles are equal, they are f right angles. PROP. XXXII. THEOR. **If a straight line touch a circle, and from the point of contact** a straight line be drawn cutting the circle ; the angles which this line makes with the line touching... | |
| John Playfair - 1829 - 186 páginas
...to DE; therefore FC is perp. to DE. Therefore, if a straight line &c. QED PROPOSITION XIX. THEOREM. **If a straight line touch a circle, and from the point of contact** a straight line be drawn perpendicular to the tangent, the centre of the circle is in that line. •... | |
| John Playfair - 1836 - 114 páginas
...less than a right angle ; wherefore the other ADC is greater than a right angle. PROP. XXIII. THEOR. **If a straight line touch a circle, and from the point of contact** a straight line be drawn cutting the circle, the angles made by this line with the line touching the... | |
| 1836 - 472 páginas
...it is equal to the same two ; and when the adjacent angles are equal, they are right angles. XXXI. **If a straight line touch a circle, and from the point of contact** a straight line be drawn cutting the circle, the angles made by this line with the line which touches... | |
| Euclid - 1837 - 390 páginas
...semicircle is acute, and an angle in a segment less than a semicircle is obtuse. PROP. XXXII. THEOR. **IF a straight line touch a circle, and from the point of contact** a straight line be drawn dividing the circle into two segments ; the angles made by this line with... | |
| Euclides - 1838
...supposed to have been subjoined, not by Euclid, but by some one of the early editors. PROP. XIX. THEOR. **If a straight line touch a circle, and from the point of contact** a straight line be drawn at right angles to the touching line, the centre of the circle shall be in... | |
| Euclides - 1841
...two; and when the adjacent angles are equal, they are right* angles. »iol>ef. PROP. XXXII. THEOR. **If a straight line touch a circle, and from the point of contact** a straight line be drawn cutting the circle, the angles which this line makes with the line touching... | |
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