 | Robert Simson - Trigonometry - 1806 - 546 pages
...DF at right angles to DE ; DF touches the circle d. PROP. XVIII. THEOR. IF a straight line touches a circle, the straight line drawn from the centre...be perpendicular to the line touching the circle. Let the straight line DE touch the circle ABC in the point C ; take the centre F, and draw the straight... | |
 | John Playfair - Mathematics - 1806 - 320 pages
...the centre E, and DF at right angles to DE ; DF touches the circled. PROP. XVIII. THEOR. Book III. IF a straight line touch a circle, the straight line drawn from the centre to the point of contact is perpendicular to the line touching the circle. Let the straight line DE touch the circle ABC in... | |
 | Euclid - Geometry - 1810 - 554 pages
...draw DE to the centre E and EF at right angles to DE; DF touches the circle d. PROP. XVIII. THEOR. IF a straight line touch a circle, the straight line...be perpendicular to the line touching the circle. Let the straight line DE touch the circle ABC in the point C; take the centre F, and draw the straight... | |
 | John Mason Good - 1813 - 714 pages
...the circumfer.ence, which shall touch a given circle. Prop. XVIII. Theor. If a btfaight line touches a circle, the straight line drawn from the centre...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... | |
 | Peter Fleming - Surveying - 1815 - 250 pages
...squares of the two parts together with twice the rectangle of the parts, 12. If a straight line touches a circle, the straight line drawn from the centre...be perpendicular to the line touching the circle, ... îbid. 95 26 ibid, 27 28 29 - 30 ibid. 31 ibid. 33 ibid. Page Theorem 13. If a straight line touches... | |
 | Euclides - 1816 - 588 pages
...and DF at right angles to DE; DF touches the circle d. PROP. XVIII. THEOR. IF a straight line touches a circle, the straight line drawn from the centre...be perpendicular to the line touching the circle. Let the straight line DE touch the circle ABC in the point C ; take the centre F, and draw the straight... | |
 | John Playfair - Circle-squaring - 1819 - 350 pages
...centre E, and DF at right angles to DE : DF touches the circle (Cor. 16. 3.) ' PROP. XVIII. THEOR. If a straight line touch a circle, the straight line drawn from the centre to the point of contact, is perpendicular to the line touching the circle. Let the straight line DE touch the circle ABC in... | |
 | John Mason Good - 1819 - 800 pages
...the circumfer'eace, which shall touch a given circle. Prop. XVIII. Theor. If a straight line touches a circle, the straight line drawn from the centre to the point of contact, shall be perpendicular tu the line touching the circle. Prop. XIX. Theor. If a straight line touches л circle, and from the... | |
 | Daniel Cresswell - Geometry - 1819 - 446 pages
...cor.) the tangent, so terminated, subtends at the centre of the circle a right / , and (E. 18. 3.) the straight line drawn from the centre to the point of contact, meets that tangent at right IL, and is, .-., (E. 8. 6. cor.) a mean proportional between the segments... | |
 | Euclid, Robert Simson - Geometry - 1821 - 514 pages
...centre E, and EF at right angles to DE; DF touches the circle (cor. 16. 3.). PROP. XVIII. THEOR. IP a straight line touch a circle, the straight line...be perpendicular to the line touching the circle. Let the straight line DE touch the circle ABC in the point C; take the centre F, and draw the straight... | |
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If a straight line touch a circle, the straight line drawn from the centre to the point of contact shall be perpendicular to the line touching the circle. 
