A circle is a shape consisting of all points in a plane that are at a given distance from a given point, the centre. Equivalently, it is the curve traced out by a point that moves in a plane so that its distance from a given point is constant. The distance between any point of the circle and the centre is called the radius. Usually, the radius is required to be a positive number. A circle with
r
=
0
{\displaystyle r=0}
is a degenerate case. This article is about circles in Euclidean geometry, and, in particular, the Euclidean plane, except where otherwise noted.
Specifically, a circle is a simple closed curve that divides the plane into two regions: an interior and an exterior. In everyday use, the term "circle" may be used interchangeably to refer to either the boundary of the figure, or to the whole figure including its interior; in strict technical usage, the circle is only the boundary and the whole figure is called a disc.
A circle may also be defined as a special kind of ellipse in which the two foci are coincident, the eccentricity is 0, and the semi-major and semi-minor axes are equal; or the two-dimensional shape enclosing the most area per unit perimeter squared, using calculus of variations.
Three plucky women lift the spirits of home-front brides in wartime Britain, where clothes rationing leaves little opportunity for pomp or celebration.
After renowned fashion designer Cressida Westcott loses both her home and her design house in the London Blitz, she has nowhere to go but the...
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di na makapag work out , kahit jogging walking man lang .. nag gain na din ako...
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What's In?
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