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½ r² ∅

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θ ° 360 ° 2 π 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=πr^2

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C=2πr

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an inscribed angle is the angle formed in the interior of a circle when two secant lines intersect on the circle

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is an 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 greater than or equal to radians.

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is an arc of a circle having measure less than or equal to radians.

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a curved line that is part of the circumference of a circle

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is like a slice of pie (a circle wedge).

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the ratio of the hypotenuse to the shorter side adjacent to an acute angle; the reciprocal of a cosine.

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a line segment within a circle that touches 2 points on the circle.

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a line perpendicular to the radius that touches ONLY one point on the circle.

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distance from center of circle to any point on it.

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the longest distance from one end of a circle to the other.

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