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A=πr^2
A: Area
r^2: Radius square

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A=2πr
A: Area
r: Radius

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Standard form of the equation of a cirlce 

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Standard form of the equation of a cirlce 

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(x-h)^2+(y-k)^2=r^2

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A= πr^2
A: Area
r^2: radius square

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C= 2πr
C: Circumfrence
r: Radius

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

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

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is a one-dimensional locus of points that forms half of a circle

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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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is a portion 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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It is the locus of all points equidistant from a central point

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is a line that intersects the curve in at least two (distinct) points.

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is a line segment joining two points on any curve, for instance an ellipse.

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A straight line or plane that touches a curve or curved surface at a point, but if extended does not cross it at that point.

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A straight line from the center of a figure to the edge of it

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A line that passes through the center of a figure from side to side