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Angle/360°xπr ²

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L= n°/360°x2πr
L- Length
π- Pi
r- radius

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Formula: (x – h)² + (y – k)² = r 2
r 2 -radius squared

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Formula: A=πr ²
A- Area
π- Pi
r ²- radius squared

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Formula: C=2πr or C=πd
C- Circumference
π- Pi
r- radius
d- diameter

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the angle formed in the interior of a circle when two secant lines (or, in a degenerate case, when one secant line and one tangent line of that circle) intersect on the circle; the angle subtended at a point on the circle by two given points on the circle.

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

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a one-dimensional locus of points that forms half of a circle; full arc of a semicircle always measures 180°

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an arc of a circle having measure greater than or equal to radians

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

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a portion of the circumference of a circle

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part of a circle enclosed by two radii of acircle and their intercepted 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; a line segment joining two points on any curve

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A line which touches a circle or ellipse at just one point

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

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set of all points in a plane that are at a given distance from a given point, the center.