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A flat surface that extends forever in two dimensions.

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A varient of the Pythagorean Theorem that you use in geometry

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Formal definitions are formed using other defined words or terms

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A part of a line that begins at a particular point and extends endlessly in one direction.

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An endpoint is a point at the end of a line segment or a ray.

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A part of a line that is bounded by two distinct endpoints and contains every endpoint on the line between its endpoints

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An intersection is a point, line, or curve common to two or more objects

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Midpoint of a line segment is the point that is halfway between the endpoints of the line segment

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An obtuse is more than 90 degrees but less than 180 degrees. In other words, it is between a right angle and a straight angle.

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Line. In geometry a line: is a straight (no bends), has no thickness, and; extends in both directions without end (infinitely). A line has no ends ! Play with it. Change the position of points A and B. Not that line AB extends forever in both directions: Line Segment.