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½ r² ∅

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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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angle formed in the interior of a circle when two secant lines intersect on the circle.

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Angle with endpoints and located on a circle's circumference and vertex located at the circle's center

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a half of a circle or of its circumference.

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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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plane enclosed by two radii of a circle and

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Straight line that touches a curve at a point

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Straight line from the center of a circle

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Straight line from side to side of a circle

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Round plane figure whose circumference consist of equidistance from a fixed point