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½ r² ∅
R= Radius

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Length=θ°360°2πr
π= Pi
R= Radius

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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=πr^2
A= Area
π= Pi
R= Radius

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C=2πr
C= Circumference
π= Pi
R= Radius

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

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The angle that forms when two radii meet at the center of a circle.

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A one-dimensional locus of points that forms half of a circle. The full arc of a semicircle always measures 180°.

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An arc of a circle having measure greater than or equal to (radians).

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An arc of a circle having measure less than or equal to (radians).

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A portion of the circumference of a circle

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The plane figure enclosed by two radii of a circle or ellipse and the arc between them.

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A line that intersects the circle in two different points.

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The line segment connecting two points on a circle's circumference.

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a straight line or plane that touches a curve or curved surface at a point, but if extended does not cross it at that point.

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a straight line from the center to the circumference of a circle or sphere.

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A straight line passing from side to side through the center of a circle or sphere.

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A round plane figure whose boundary (the circumference) consists of points equidistant from a fixed point (the center)