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½ r² ∅

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Length=θ°360°2πr

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Standard form of the equation of a circle formula

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Standard form of the equation of a circle formula

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(x – h)² + (y – k)² = r²

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A = π r²

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C

=

2

π

r

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

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The larger arc joining two points on the circumference of a circle.

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The shorter arc joining two points on the circumference of a circle.

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arc is any smooth curve joining two points

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

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line that intersects two or more points on a curve

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A line segment connecting two points on a curve

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A line that touches a curve at a point without crossing over

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any of the line segments from its center to its perimeter, and in more modern usage, it is also the length of any of them

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

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the locus of all points equidistant from a central point