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Formula: ½ r² ∅

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Formula:
Length = θ°/360° (2πr)

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Formula: (x – h)² + (y – k)² = r²

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Formula: A = πr^2

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Formula: C = 2πr

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Def: the angle formed in the interior of a circle when two secant lines intersect on the circle

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Def: The angle subtended at the center of a shape by two given points on its periphery

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Def: a half of a circle or of its circumference

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Def: A major arc is larger than a semicircle

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Def: A minor arc is an arc smaller than a semicircle

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Def: a part of the circumference of a circle or other curve

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Def: the plane figure enclosed by two radii of a circle or ellipse and the arc between them

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Def: a straight line that cuts a curve in two or more parts

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Def: a straight line joining the ends of an arc

# data[].attributes.body
Def: 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

# data[].attributes.body
Def: a straight line from the center to the circumference of a circle or sphere

# data[].attributes.body
Def: a straight line passing from side to side through the center of a body or figure, especially a circle or sphere

# data[].attributes.body
Def: a round plane figure whose boundary (the circumference) consists of points equidistant from a fixed point (the center)