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 the circle, shall be equal to the angles which are in the alternate segments of the circle. The Elements of Geometry, Symbolically Arranged - Page 77by Great Britain. Admiralty - 1846Full view - About this book
| John Playfair - Euclid's Elements - 1806 - 320 pages
...is perpendicular to DE. Therefore, if a straight line, &c. QED a 17. 1. b 19. i. 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. Book III. Let the straight... | |
| Robert Simson - Trigonometry - 1806 - 518 pages
...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. if possible,... | |
| Euclid - Geometry - 1810 - 518 pages
...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 that line. Let the straight... | |
| John Mason Good - 1813 - 722 pages
...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.... | |
| Charles Butler - 1814 - 568 pages
...demonstration, that these three perpendiculars BE, GF, and CD intersect each other in the same point AQED 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... | |
| Peter Fleming - Surveying - 1815 - 242 pages
...ībid. 95 26 ibid, 27 28 29 - 30 ibid. 31 ibid. 33 ibid. Page Theorem 13. If a straight line touches **a circle, and from the point of contact, a straight line be drawn, cutting the circle, the** angle made by this line with the first line, shall be equal to the angle in the alternate segment of... | |
| Euclides - 1816 - 528 pages
...perpendicular to DE. Therefore if a straight , . line^&c. QED D" c 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, John Playfair - Circle-squaring - 1819 - 348 pages
...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 Playfair - 1819 - 317 pages
...they are right angles. PROP. XXXII. THEOR. ."-> If a straight line touch a circle, and from the pbitit **of contact a straight line be drawn cutting the circle, the angles** made fry this line with the line which touches the circle, shall be equal to the angles in the alternate... | |
| John Mason Good - 1819 - 740 pages
...shall be perpendicular tu the line touching the circle. Prop. XIX. Theor. If a straight line touches л **circle, and from the point of contact a straight line be drawn** at right angles to the touchingline, the centre of the circle shall be in that line. Prop. XX. Theor.... | |
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