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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 |
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