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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.
The Elements of Euclid: The Errors, by which Theon, Or Others, Have Long Ago ... - Page 3
by Robert Simson - 1762 - 466 pages

The Teacher's Assistant in the "Course of Mathematics Adapted to the Method ...

Mathematics - 1836 - 488 pages
...plain 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 diameter of a circle is a straight line...

Elements of Plane Geometry According to Euclid

Andrew Bell - Euclid's Elements - 1837 - 290 pages
...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. 15. This point is called the centre of the circle. 16. A diameter of a circle is a straight line drawn...

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

John Playfair - Euclid's Elements - 1837 - 332 pages
...one line, which is called the circumference, and is such that all straight lines drawn from a certaia 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 diameter of a circlets a straight line...

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

Euclides - Geometry - 1841 - 378 pages
...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 one another. XVI. And this point is called the centre of the circle. XVII. A diameter of a circle is a straight line drawn through the centre, and...

Lessons on the globes

T H. Howe - 1842 - 458 pages
...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. c That point within the circle which is thus equally distant from the circumference, is called the...

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

John Playfair - Euclid's Elements - 1842 - 332 pages
...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 diameter of a circle is a straight line...

Elements of geometry: consisting of the first four,and the sixth, books of ...

Euclides - 1842 - 316 pages
...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. XVL This point is called the centre of the circle. XVII, A diameter of a circle is a straight line...

A course of practical geometry for mechanics

William Pease - Geometry - 1843 - 80 pages
...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 one another. XVI. And this point is called the centre of the circle. A circle is the superficies or space enclosed by its circumference. 14. A great...