en.wikipedia.org/wiki/Circular_segment

In geometry, a circular segment (symbol: ⌓) is a region of a circle which is "cut off"
from the rest ... The angle thus inscribed is θ/2 and is part of a right triangle
whose hy...

www.khanacademy.org/math/basic-geo/basic-geo-area-and-perimeter/area-circumference-circle/v/parts-of-a-circle

The center of a circle is the point at which the distance to any part on the circle is
exactly the same distance. The center is at the middle of the diameter and ...

www.mathopenref.com/pictorialindex.html

A pictorial index to the parts of a circle. A diagram with links to full definitions.

www.emathzone.com/tutorials/geometry/the-circle-and-parts-of-a-circle.html

An arc is a part of the circumference between two points or a continuous piece of
a circle. The shorter arc between P and Q is called the minor arc PQ. The ...

www.algebralab.org/lessons/lesson.aspx?file=Geometry_CircleDefinitions.xml

Introduction: A circle is all points equidistant from one point called the center of
the circle. Segments drawn near and through the circle create other geometrical ...

www.mathsisfun.com/geometry/circle.html

radius diameter circumference: circle/diameter = pi = 3.14159... The Radius is the
distance from ... And a part of the circumference is called an Arc. circle slices ...

www.mathgoodies.com/lessons/vol2/geometry.html

A circle is an important shape in the field of geometry. Let's look at the definition
of a circle and its parts. We will also examine the relationship between the circle ...

www.mathplanet.com/education/geometry/circles/basic-information-about-circles

The points within the hula hoop are not part of the circle and are called interior ...
The distance between the midpoint and the circle border is called the radius.

www.onlinemathlearning.com/diameter-of-circle.html

Parts of a Circle - Diameter, Chord, Radius, Arc, Tangent, Intersecting Circles,
Internal and External Tangents with examples, step by step solutions, definitions,
...

www.ck12.org/geometry/Parts-of-Circles/lesson/Parts-of-Circles-BSC-GEOM/

Feb 24, 2012 ... Circles. A circle is the set of all points in the plane that are the same distance
away from a specific point, called the center. The center of the ...