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更新日期：2016-10-19
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Equation of a circle.
The Geometry of Circles.
The diameter of a circle.
The radius of a circle.
The circumference of a circle.
The area of a circle.
The chord of a circle.
The arc length of a circle.
The area of a sector of a circle.
The formula for the arc length of a circle.
The segment height of Circle.