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A circle is a plane figure bounded by a curved line, every point of which is equally distant from a point within called the center.
Elements of Plane Geometry: For the Use of Schools - Page 31
by Nicholas Tillinghast - 1844 - 96 pages

Elements of Geometry: With Notes

John Radford Young - Euclid's Elements - 1827 - 208 pages
...AB, are equivalent to the squares of AM, CM, although M is not the middle of the base BC. BOOK III. DEFINITIONS. 1. Every line which is not straight is...circle is a space enclosed by a curve line, every point in which is equally distant from a point within the figure; which point is called the centre. 3. The...

Elements of Geometry and Conic Sections

Elias Loomis - Conic sections - 1849 - 252 pages
...III. THE CIRCLE, AND THE MEASURE OF ANGLES. Definitions. 1. A circle is a plane figure bounded by a line, every point of which is equally distant from a point within, called the center. This bounding line is called the circumference of the circle. 2. A radius of a circle...

Elements of Analytical Geometry and of the Differential and Integral Calculus

Elias Loomis - Calculus - 1851 - 300 pages
...become x=r cos. «, y=r sin. v. SECTION IT. ON THE CIRCLE. (32.) A CIRCLE is a plane figure bounded by a line, every point of which is equally distant from a point within called the center. This bounding line is called the circumference of the circle. A radius of a circle...

Stoddard's Practical Arithmetic

John Fair Stoddard - Arithmetic - 1852 - 324 pages
...t«i, a DECAGON ; that of twelve, a DODECAGON, &-i•.. A CIRCLE is a plane, terminated by a curved line, every point of which is equally distant from a point within, culled the center. The curved line is called the circumference The DIAMETER of a circle is a line passing...

Elements of Physical and Political Geography: Designed as a Text Book for ...

Cornelius S. Cartee - Physical geography - 1855 - 348 pages
...and breadth without thickness, and may be either plane or curved. 97. A circle is a figure bounded by a curve line, every point of which is equally distant from the centre. The line which limits a circle is the circumference. A straight line passing through the...

Mathematical Dictionary and Cyclopedia of Mathematical Science: Comprising ...

Charles Davies, William Guy Peck - Mathematics - 1855 - 630 pages
...Descriptive Geometry, Shade» and Shadows, Perspective, Spherical Projections, and Isometrical Projcca curved line, every point of which is equally distant from a point within, called the centre. The curve is called the circumference, or in common language, the circle. So that...

The American Philosophical Arithmetic: Designed for the Use of Advanced ...

John Fair Stoddard - Arithmetic - 1856 - 312 pages
...that of ten, a DECAGON ; that of twelve, a DODECAGON, &c. A CIRCLE is a plane, terminated by a curved line, every point of which is equally distant from a point within, called the centre. The curved line is called the circumference. The DIAMETER of a circle is a line...

Elements of Geometry and Conic Sections

Elias Loomis - Conic sections - 1858 - 252 pages
...III. THE CIRCLE, AND THE MEASURE OF ANGLES. Definitions. 1. A circk is a plane figure bounded by a line, every point of which is equally distant from a point within, called the center. This bounding line is called the circumference of the circle. 2. A radius of a circle...