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½ r² ∅

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s=r0

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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=πr2

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C=2πr

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

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Definition: the angle that forms when two radii meet at the center of a circle

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Definition: a closed shape consisting of half a circle and a diameter of that circle

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Definition: an arc of a circle having measure greater than or equal to (radians)

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Definition: an arc of a circle having measure less than or equal to (radians)

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Definition: a portion of the circumference of a circle

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Definition: the part of a circle enclosed by two radii of a circle and their intercepted arc

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Definition: a line that intersects two or more points on a curve

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Definition: a straight line segment whose endpoints both lie on the circle

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Definition: a line which touches a circle or ellipse at just one point

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Definition: any of the line segments from its center to its perimeter

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Definition: any straight line segment that passes through the center of the circle and whose endpoints lie on the circle

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Definition: a simple closed shape