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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.
First principles of Euclid: an introduction to the study of the first book ... - Page 18
by T S. Taylor - 1880

## A Practical Treatise of Perspective, on the Principles of Dr. Brook Taylor

Edward Edwards - Perspective - 1806 - 414 pages
...properties of right lines and angles, it will be neceflary to fpeak of the circle. A CIRCLE is a plain figure contained by one line, which is called the circumference, and is fuch, that all ftraight lines drawn from a certain point within the figure to the circumference, are...

## An Essay on the Teeth of Wheels: Comprehending Principles, and Their ...

Robertson Buchanan - Gearing - 1808 - 216 pages
...which meeting do not lie in one line. 2. A triangle is a figure contained by three straight lines. 3. A circle is a plane figure contained by one line,...within the figure to the circumference, are equal to one another, and this point is called the centre of the circle. 4. The radius of a circle, is a...

## Pantologia. A new (cabinet) cyclopędia, by J.M. Good, O. Gregory ..., Volume 5

John Mason Good - 1813 - 714 pages
...the extremity of "any thin?." H. A figure is that which is inclosed by one qr more boundaries. 15. A circle is a plane figure contained by one line., which is railed the circumference, and is such that all straight lines drawn from a certiiu point within the...

## The Elements of Euclid; viz. the first six books, together with the eleventh ...

Euclides - 1814 - 560 pages
...is inclosed by one or more boundaries. XV. A circle is a plane figure contained by one line, winch is called the circumference, and is such that all...within the 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...

## 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...

## A Treatise on Spherics: Comprising the Elements of Spherical Geometry, and ...

Daniel Cresswell - Geometry - 1816 - 352 pages
...OF A 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...

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

John Playfair - Circle-squaring - 1819 - 350 pages
...space contained in a figure, i.mj reference, to the nature of the line or lines which bound it. XI. A circle is a plane figure contained by one line,...within the 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...

## Pantologia. A new (cabinet) cyclopędia, by J.M. Good, O. Gregory ..., Volume 5

John Mason Good - 1819 - 800 pages
...ia the extremity of any thing" 14. A figure is that which is inclosed by one or more boundaries. 15. A circle is a plane figure contained by one line, which is called the circumference, mid is such that all straight lines dra'.vn from a cenain |X)int within the figure ю the circumference,...