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½ r² ∅

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2πr(c/360)

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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

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C=2πr

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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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A half of a circle or of its circumference.

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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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A part of the circumference of a circle or other curve.

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

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A straight line that joins the ends of an arc.

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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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The radius of an object or shape is half of the same objects diameter.

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A straight linear plane that passes through an object, usually a circle.

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A 2-dimensional shape that is a constant curve that always remains the same distance from the center.