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The circle is a highly symmetric shape: every line through the centre forms a line of reflection symmetry, and it has rotational symmetryaround the centre for every angle. Its symmetry groupis the orthogonal groupO(2,R). The group of rotations alone is the circle groupT. All circles are similar.
Concentric objects. An archery target, featuring evenly spaced concentric circles that surround a "bullseye". In geometry, two or more objects are said to be concentric when they share the same center. Any pair of (possibly unalike) objects with well-defined centers can be concentric, including circles, spheres, regular polygons, regular ...
Category. : Circles. Wikimedia Commons has media related to Circles. For more information, see the article about circle. Articles relating to circles, 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 ...
t. e. In physics, circular motion is a movement of an object along the circumference of a circle or rotation along a circular arc. It can be uniform, with a constant rate of rotation and constant tangential speed, or non-uniform with a changing rate of rotation. The rotation around a fixed axis of a three-dimensional body involves the circular ...
30-60-90 triangle. Isosceles right triangle. Kepler triangle. Scalene triangle. Quadrilateral – 4 sides. Cyclic quadrilateral. Kite. Parallelogram. Rhombus (equilateral parallelogram)
Its symbol was a maroon-on-white emblem consisting of three solid circles in a surrounding circle. It has also been used as a peace banner. In 1935 a pact initiated by Roerich was signed by the United States and Latin American nations, agreeing that "historic monuments, museums, scientific, artistic, educational and cultural institutions ...
In geometry, a diameter of a circle is any straight line segment that passes through the centre of the circle and whose endpoints lie on the circle. It can also be defined as the longest chord of the circle. Both definitions are also valid for the diameter of a sphere. In more modern usage, the length of a diameter is also called the diameter.
Plato explains how we are always many steps away from the idea or Form. The idea of a perfect circle can have us defining, speaking, writing, and drawing about particular circles that are always steps away from the actual being. The perfect circle, partly represented by a curved line, and a precise definition, cannot be drawn.