 | Euclides - 1861 - 464 pages
...; if without, as AF, the ¿_ FAB is > a rt. ¿. VB Pnоr. 32. — THEOK. If a straight line touches a circle, and from the point of contact a straight line be drawn cutting the circle ; the angles which this line makes icith the line touching the circle, shall be... | |
 | Euclides - 1862 - 140 pages
...perpendicular to DE. Conclusion. — Therefore, if a straight line, Sus. QED PROPOSITION 19. -THEOREM, If a straight line touch a circle, and from the point...touching line, the centre of the circle shall be in 't/uit line. (Reference— Prop. III. 18.) EUCLID S ELEMENTS. Sequence. — The centre of the circle... | |
 | Euclides - 1862 - 172 pages
...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 with the line touching the circle shall be equal... | |
 | Euclides - 1864 - 262 pages
...that is, FC is perpendicular to DE. Therefore, if a straight line, &c. QED PROPOSITION XIX. THEOREM. If a straight line touch a circle, and from the point...be drawn at right angles to the touching line, the center of the circle shall be in that line. Let the straight line DE touch the circle ABU in C, and... | |
 | Euclides - 1864 - 448 pages
...when the adjacent angles are equal, they are right angles. (I. def. 10.) PROPOSITION XXXII. THEOREM. If a straight line touch a circle, and from the point of contact a straight line be drawn meeting the circle ; the anglc-s which this line makes with the line touching the circle shall be equal... | |
 | Robert Potts - 1865 - 528 pages
...when the adjacent angles are equal, they are right angles, (i. def. 10.) PROPOSITION XXXn. THEOREM. If a straight line touch a circle, and from the point of contact a straight line be drawn meeting the circle; the angles which this lint makes with the line touching the circle shall be equal... | |
 | Euclides - 1865 - 402 pages
...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 with the line touching the circle shall be equal... | |
 | Architecture - 1865 - 276 pages
...or in the circumference, which shall touch a given circle. 32. Theorem. If & straight line touches 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... | |
 | James Robert Christie - Mathematics - 1866 - 426 pages
...radius a, about its diameter. i • • J; >. , г.- •• . . - • I. GEOMETRY. > » •' *•"' 1. ' 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, && . 2. The sides about the equal angles of equiangular... | |
 | John Playfair - Geometry - 1855 - 358 pages
...other line but FC can be perpendicular to DE ; FC is therefore perpendicular to DE. B PROP. XIX. THEOR. If a straight line touch a circle, and from the point of contact a stimght Imt be drawn at right angles to the touching line, the centre of the circle is in that line.... | |
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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... 
