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Angle/360º • πr^2
r= radius

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2πR(C/360)
C= central angle of the arch in degrees
R= radius of the arc
π= pi (3.14....)

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(x – h)² + (y – k)² = r^2
h= "x" value
k= "y" value
r= radius

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A=π • r^2

r= radius

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π • diameter OR 2 • π • radius

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

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A central angle is an angle with endpoints and located on a circle's circumference and vertex located at the circle's center. A central angle in a circle determines an arc.

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a half of a circle or of its circumference.

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

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A connected section of the circumference of a circle.

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The part of a circle enclosed by two radii of a circle and their intercepted arc.

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A line passing through two points on a circle

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A chord of a circle is a straight line segment whose endpoints both lie on the circle.

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a tangent line to a circle is 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).