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An inscribed angle is an angle formed by two chords in a circle that have a common endpoint. The common endpoint forms the vertex of the inscribed angle. The other two endpoints define an intercepted arc on the circle.

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A central angle is an angle where the vertex is the center of a circle and the sides are radii intersecting the circle in two places with an arc in between them.

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A half of a circle or of its circumference.

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The outside portion of the radii arc(the big arc)

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The inside portion of the radii arc(the small arc)

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An arc is a piece or portion of the outer circle or circumference of a circle.

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A circle sector (⌔), is a portion of a circle enclosed by two radii and an arc, where the smaller area is known as the minor sector and the larger being the major sector.

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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 chord of a circle is a straight line where the endpoints both lie on the circle. A line segment connecting two points of the circle.

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A tangent line to a circle is a line that touches the circle at exactly one point on the very outside edge, never actually entering the circle. It is a line through a pair of infinitely close points on the circle.

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A straight line from the center to the circumference of a circle, only following the center to the circumference.

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A straight line passing through the center of a circle reaching from one side to opposite side through the center of a circle or sphere.

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a round plane with a boundary (the circumference) consisting of points of equal distance from the center. (round shape 360 degrees around from the center point.)