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the set of points in which every segment that connects points of the set lies entirely in the set 


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a set in which at least one segment that connects points within the set has points that lie outside the set 


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the "if" clause of a conditional 


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the "then"clause of a conditional 


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The point of the segment equidistant from the segment's endpoint 


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a statement that includes a conditional and its converse 


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the set of points in a plane at a certain positive distance (its radius) from a certain point(its center) 


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a segment connecting the center of a circle or a sphere with a point on that circle or sphere; also the length of that segment 


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a segment connecting two points on the circle or sphere and containing the center of the circle of sphere; also, the length of the segment 


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the set of elements that are in either or both sets,denoted by U 


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The set of elements that are in both sets 


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the union of segments in the same plane such that each segment intersects exactly two others, one at each endpoints; and if two segments share an endpoint, they are not collinear 


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the union of two rays that have the same endpoint 


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a polygon whose polygonal region is a convex set 


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a triangle with a three sides the same length 


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a triangle with a least two sides equal in length 


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a triangle with no two sides of equal length 

