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Length=n/360 x 2πr

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Standard form of the equation of a circle

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Standard form of the equation of a circle

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(x – h)² + (y – k)² = r²

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A=πrˆ2

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C=2πr

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Formulas: circumference of a circle, area of a circle, standard form of the equation of a circle, arc length, area of a sector.

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It is the set of all points in a plane that are at a given distance from a given point, the centre; equivalently it is the curve traced out by a point that moves so that its distance from a given point is constant.

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

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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 major arc is an arc of a circle having measure greater than or equal to radian.

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A minor arc is an arc of a circle having measure less than or equal to radians.

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An arc is a portion of the circumference of a circle. An arc could be a portion of some other curved shape, such as an ellipse, but it almost always refers to a circle. It is sometimes called a circular arc.

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The part of a circle enclosed by two radii of a circle and their intercepted arc. A pie-shaped part of a circle.

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The ratio of the hypotenuse to the shorter side adjacent to an acute angle, the reciprocal of a cosine.

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A chord of a circle is a straight line segment whose endpoints both lie on the circle. A chord is also a line segment joining two points on any curve

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A line Which touches a circle oe ellipse at just one point.

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a radius of a circle or sphere is any of the line segments from its center to its perimeter

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a diameter of a circle is any straight line segment that passes through the center of the circle and whose endpoints lie on the circle. It can also be defined as the longest chord of the circle.

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an inscribed angle is the angle formed in the interior of a circle when two secant lines intersect on the circle.