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" A circle is a plane figure contained by one line, which is called the circumference, and is such that all straight lines drawn from a certain point within the figure to the circumference, are equal to one another. "
Orr's Circle of the Sciences: Organic nature, vols. 1-3 (1854-1856) - Page 45
edited by - 1854
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An Easy Introduction to the Mathematics: In which the Theory and ..., Volume 2

Charles Butler - Mathematics - 1814 - 528 pages
...figures as are contained by more than one line, as the triangle, square, polygon, &c. are excluded; "and is such that all straight lines drawn from a certain point within the figure" (called in the next following definition " the centre") to the circumference, are equal to one another...
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A Treatise on Spherics: Comprising the Elements of Spherical Geometry, and ...

Daniel Cresswell - Geometry - 1816 - 352 pages
...SPHERE AND A PLANE. DEFINITIONS. ART. 1. A- Sphere is a solid 'figure contained by one surface, and is such that all straight lines, drawn from a certain point within the figure to the surface, are equal to one another : (2.) And this point is called the Center of the Sphere. (3.) A...
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Elements of Geometry: Containing the First Six Books of Euclid, with a ...

John Playfair - Circle-squaring - 1819 - 350 pages
...bound it. XI. A circle is a plane figure contained by one line, which is called the circumference, and is such that all straight lines drawn from a certain...figure to the circumference, are equal to one another. XII. And this point is called the centre of the circle. XIII. A diameter of a circle is a straight...
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The First Six Books with Notes

Euclid - 1822 - 222 pages
...a plane figure bounded by one line,, which is called the circumference, and is such that all right lines drawn from a certain point within the figure, to the circumference, are equal to one another. 16., And this point is called the centre of the circle. 17.. A diameter of a circle is a right line-...
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Practical Essays on Mill Work and Other Machinery, Volume 1

Robertson Buchanan - Machinery - 1823 - 440 pages
...lines. 56. A circle is a plane figure contained by one line, which is called the circumference, and is such, that all straight lines drawn from a certain...figure to the circumference, are equal to one another, and this point is called the centre of the circle. 57- The radius of a circle, is a straight line drawn...
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The Elements of Euclid: The Errors by which Theon, Or Others, Have Long ...

Robert Simson - Trigonometry - 1827 - 546 pages
...boundaries. XV. A circle is a plane figure contained by one line, which is called the circumference, and is such that all straight lines drawn from a certain...figure to the circumference, are equal to one another. XVI. And this point is called the centre of the circle. XVII. A diameter of a circle is a straight...
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The Elements of Euclid: Viz, the First Six Books, Together with the Eleventh ...

Euclid, Robert Simson - Geometry - 1829 - 548 pages
...figure contained by one line, which is called the circumference, and is such that all straight lihes drawn from a certain point within' the figure to the circumference, are equal to one another : XVI. Andthis point is called the centre of the circle, XVII. A diameter of a circle is a straight...
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Geometry, Plane, Solid, and Spherical, in Six Books: To which is Added, in ...

Pierce Morton - Geometry - 1830 - 584 pages
...circle is a plane / N. figure contained by one / \ line, which is called the circumference, and is each that all straight lines drawn from a certain point...This point is called the centre of the circle ; and the distance from the centre to the circumference is called the ra. diux, or, sometimes, the semidiameter,...
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The First Six Books of the Elements of Euclid: With Notes

Euclid - Euclid's Elements - 1833 - 216 pages
...is a plane figure bounded by one line, which is called the circumference, and is such that all right lines, drawn from a certain point within the figure to the circumference, are equal to one another. 1 6. And this point is called the centre of the circle. See N. 17. A diameter of a circle is a right...
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Library of Useful Knowledge: Geometry plane, solid, and spherical [by Pierce ...

Mathematics - 1835 - 684 pages
...line, which is called the circumference, and is such that all straight lines drawn from a cer- " tain point within the figure to the circumference are equal...This point is called the centre of the circle ; and the distance from the centre to the circumference is called the radius, or, sometimes, the semidiameier,...
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