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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 = π r^2

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C = 2πr

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

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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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arc of a circle having measure greater than or equal to the radians. (right figure)

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an arc of a circle having measure less than or equal to the radians. (left figure)

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a part of the circumference of a circle or other curve. (red line in picture)

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the portion of a circle enclosed by two radii and an arc.

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

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a straight line segment whose endpoints both lie on the circle

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a line that touches the circle at exactly one point, never entering the circle's interior.

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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, especially a circle or sphere.

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a round plane figure whose boundary (the circumference) consists of points equidistant from a fixed point (the center)