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½ r² ∅
r is the radians subtended by the arc at the centre of the circle.

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(Θ ÷ 360) x (2 x π x 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
The center being at the point (h,k) and the radius being

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A = π r²

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C =2πr

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

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

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An angle with endpoints and located on a circle's circumference and vertex located at the circle's center.

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

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Measures more than a semicircle and is represented by three points.

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Measures less than a semicircle and is represented by two endpoints.

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The part of a circle enclosed by two radii of a circle and their intercepted arc.

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A secant will intersect the circle in exactly two different points.

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A straight line segment whose endpoints both lie on the circle.

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

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A round figure whose boundary consists of points at equal distances from the center.