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½ r² ∅, where r is the radius and ∅ the angle in radians subtended by the arc at the centre of the circle.

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s= r ∅

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Standard form of the equation of a circle  

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Standard form of the equation of a circle  

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(x – h)² + (y – k)² = r²

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A = π r 2

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C = 2 πr

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An inscribed angle is an angle formed by two chords in a circle which have a common endpoint.

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A central angle is the angle that forms when two radii meet at the center of a circle.

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Semicircle is a one-dimensional locus of points that forms half of a circle.

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A major arc  is an arc of a circle having measure greater than or equal to ( radians).

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A minor arc is an arc of a circle having measure less than or equal to ( radians).

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Arc is any smooth curve joining two points

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A "pie-slice" part of a circle - the area between two radiuses and the connecting arc of a circle.

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A line segment connecting two points on a curve. Example: the line segment connecting two points on a circle's circumference is a chord.

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A straight line that cuts a curve in two or more parts.

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Radius is the distance from the center of a circle or a sphere to any point on the circle or a sphere.

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A line which touches a circle or ellipse at just one point.

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A diameter of a circle is any straight line segment that passes through the center of the circle and whose endpoints lie on the circle.

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A circle is the locus of all points equidistant from a central point.