A circle is the set of all points in a plane that is the same distance
(called the radius) from a given point called the center. A circle has
infinite sides. A circle measures 360 degrees.
Some basic definitions of a circle
- A line segment within a circle that touches 2 points on the circle is
called a chord.
- A line within a circle that touches 2 points on the circle is called
a Secant.
- The longest distance from one end of a circle to the other is called
the diameter. Diameter is the longest chord of the circle. The diameter of
the circle is twice the radius.
- The distance or the perimeter around the circle is called
circumference. Circumference = 2 π r or π d. (π = 3.14)
- The area of the circle enclosed between any two radii and either of
the arcs that are cut off is called the sector of the circle.
Area of the circle lying between a chord and the corresponding arc cut
off by the chord is called a segment.
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