 | Robert Simson - 1806 - 546 sider
...perpendicular to DE. Therefore, if a straight line, 6cc. QED PROP. XIX. THEOR. IF a straight line touches 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 that line. Let the straight... | |
 | Euclid - 1810 - 554 sider
...is FC is perpendicular to DE. Therefore, if a straight line, &c. QED C a 18. 3. PROP. XIX. THEOR. GE 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 that line. L« the straight... | |
 | John Mason Good - 1813 - 714 sider
...shall be perpendicular to the line touching the circle. Prop. XIX. Theor. If a straight line touches a circle, and from the point of contact a straight line be drawn at right angles to the. touching line, the centro of the circle shall be in that line. Prop. XX. Theor.... | |
 | Euclides - 1814 - 560 sider
...is opposite; Therefore FC is greater than FG; but FC it PROP. XIX. THEOR. IF a straight line touches 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 that line. Let the straight... | |
 | Charles Butler - 1814 - 528 sider
...demonstration, that these three perpendiculars BE, GF, and CD intersect each other in the same point A. QED 249. If a straight line touch a circle, and from the point of contact two chords be drawn, and if from the extremity of one of them, a straight line be drawn parallel to... | |
 | Charles Butler - 1814 - 582 sider
...demonstration, that these three perpendiculars BE, GF, and CD intersect each other in the same point A. QED 249. If a straight line touch a circle, and from the point of contact two chords be drawn, and if from the extremity of one of them, a straight line be drawn parallel to... | |
 | John Playfair - 1819 - 354 sider
...DE ; FC is therefore perpendicular to DE. Therefore, if a straight line, &c. QED 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 line. Let the straight line... | |
 | John Playfair - 1819 - 350 sider
...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 line. Let the straight line... | |
 | John Mason Good - 1819 - 800 sider
...less than a semicircle is greater than a right angle. Prop. XXX IL Thcor. If a straight line touche» a circle, and from the point of contact a straight line be drawn culling the circle, the angles made by this line with the line touching the circle, shall be equal... | |
 | Euclid, Robert Simson - 1821 - 514 sider
...that is FC is perpendicular to DE. Therefore, if a straight line, &c. QED D PROP. XIX. THEOR. C G E 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 that line. Let the straight... | |
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(i. 32) and when the adjacent angles are equal, they are right angles, (i. def. 10.) PROP. XXXII. —THEOREM. If a straight line touch a circle, and from the point of contact a straight line be drawn cutting the circle; then the angles made by this line... 
