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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.
A Treatise on Spherics: Comprising the Elements of Spherical Geometry, and ... - Page iii
by Daniel Cresswell - 1816 - 294 pages

The First Six, and the Eleventh and Twelfth Books of Euclid's Elements: With ...

Euclid, James Thomson - Geometry - 1845 - 380 pages
...circle is a plane figure contained by one line, which is called the circumference* and is such that R all straight lines drawn from a certain point within the figure to the circumference are equal to one another.* 31. That point is called the centre of the circle. 32. Any...

The Elements of Geometry, Symbolically Arranged

Great Britain. Admiralty - Geometry - 1846 - 130 pages
...boundaries. XV. Acircle is aplane 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. XVI. And this point is called the centre of the circle. XVII....

The Elements of Geometry, Symbolically Arranged

Great Britain. Admiralty - Geometry - 1846 - 130 pages
...more boundaries. XV. Acircleis aplanefigure 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. XVI. And this point is called the centre of the circle. XVII....

The Elements of Euclid, the parts read in the University of Cambridge [book ...

Euclides - 1846 - 292 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 point within the figure to the circumference, are equal to one another : xvi. And this point is called the centre of the circle. xvn....

Elements of Geometry: Containing the First Six Books of Euclid, with a ...

John Playfair - Euclid's Elements - 1846 - 332 pages
...bound it. 11. 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. 12. And this point is called the centre of the circle. 13....

A Technological Dictionary: Explaining the Terms of the Arts, Sciences ...

W. M. Buchanan - Science - 1846 - 768 pages
...Lat. circulus, from circus. A geometrical figure contained under one line called the circumference ; and is such, that all straight lines drawn from a certain point within the figure called the centre, to the circumference, arc equal to one another. Thus, In the figure, AB = AC = AD....

The First Book of Euclid's Elements, Simplified, Explained, and Illustrated ...

Euclides - 1847 - 128 pages
...its area. 15. 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 : — 16. And this point is called the centre of the circle....

Elements of Geometry: With Practical Applications ...

George Roberts Perkins - Geometry - 1847 - 308 pages
...Art. 178.] XXIII. A circle is a plane figure bounded by one line, which is called the circumference ; and is such that all straight lines drawn from a certain point within the circle to the circumference, are equal to one another. This point is called the centre of the circle....