| John Playfair - Geometry - 1836 - 114 pages
...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 circle, shall be equal... | |
| Mathematics - 1836 - 472 pages
...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 the circle, shall be equal... | |
| John Playfair - Geometry - 1837 - 332 pages
...perpendicular to DE ; FC is therefore perpendicular to DE. 74 N PROP. XIX. THEOR. If a. straight linf **touch a circle, and from the point of contact a straight...angles to the touching line, the centre of the circle** is in that line. Let the straight line DE touch the circle ABC, in C, and from C let CA be drawn at... | |
| Euclid - Geometry - 1837 - 410 pages
...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 the tangent are equal to... | |
| Euclides - Euclid's Elements - 1837 - 112 pages
...ADC = 2 right Zs, 2. that Z ADC > right Z • PROPOSITION XXXII. Theorem. If a straight line touches **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 circle shall be equal to... | |
| Andrew Bell - Euclid's Elements - 1837 - 240 pages
...; that is, FC is perpendicular to DE. PROPOSITION XIX. THEOREM. If a straight line be a tangent to **a circle, and from the point of contact a straight line be drawn** perpendicular to the tangent, the centre of the circle shall be in that line. Let the straight line... | |
| Euclid - Geometry - 1838 - 478 pages
...perpendicular to DE. There- D fore, if a straight line, &c. Q,. ED G THE ELEMENTS OF EUCLID. PROP. XIX. THEOR. **IF a straight line touch a circle, and from the point...line, the centre of the circle shall be in that line.** i Let the straight line DE touch the circle ABC in C, and from C let CA be drawn at right angles to... | |
| Euclides - 1838 - 264 pages
...extremities of the less arc i8 greater than this right angle. PROP. XXXII. THEOR. 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 with the line touching the circle shall be equal... | |
| Euclides - 1841 - 378 pages
...two; and when the adjacent angles are equal, they are right* angles. ģiol>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 the circle, shall be equal... | |
| John Playfair - Euclid's Elements - 1842 - 332 pages
...to the same two ; and when the adjacent angles are equal, they are 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 made by this line with the line which touches the circle, shall be equal... | |
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