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a round plane figure whose boundary (the circumference) consists of points equidistant from a fixed point (the center).

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a straight line passing from side to side through the center of a body or figure, especially a circle or sphere.

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a straight line from the center to the circumference of a circle or sphere

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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 joining the ends of an arc.

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

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A connected section of the circumference of a circle. Arcs are measured in two ways: as the measure of the central angle, or as the length of the arc itself.

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is an arc of a circle having measure less than or equal to its radius

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is an arc of a circle having measure greater than or equal to radius

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a semicircle is a one-dimensional locus of points that forms half of a circle. The full arc of a semicircle always measures 180°

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

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

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C=2πr

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A=πr2

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(x – h)² + (y – k)² = r²

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Area of a Sector=(θ/360)πr^

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Length = (θ ° /360) ° 2 π r.