# data[].attributes.body
½ r² ∅

# data[].attributes.body
2πR(C/360)

# data[].attributes.headline
Standard form of the equation of a circle

# data[].attributes.subject
Standard form of the equation of a circle

# data[].attributes.body
ax ² + by ² + cx + dy + e = 0,

# data[].attributes.body
πr^2

# data[].attributes.body
C = 2π

# data[].attributes.body
an angle formed by two chords in a circle which have a common endpoint.

# data[].attributes.body
a semicircle is a one-dimensional locus of points that forms half of a circle.

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Central angles are subtended by an arc between those two points, and the arc length is the central angle of a circle of radius one.

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

# data[].attributes.body
an arc is a closed segment of a differentiable curve.

# data[].attributes.body
the plane figure enclosed by two radii of a circle or ellipse and the arc between them.

# data[].attributes.body
The larger arc joining two points on the circumference of a circle.

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the ratio of the hypotenuse to the shorter side adjacent to an acute angle (in a right-angled triangle); the reciprocal of a cosine.

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a straight line joining the ends of an arc.

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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.

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

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

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