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| An unproven statement based on observations. |
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| looking for patterns and making conjectures. |
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| an example that shows a conjecture is false. |
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| using known words to describe a new word. |
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| an exact location; having no dimension. |
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| A set of points extending in one dimension. |
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| an infinite set of points extending in two-dimensions. |
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| part of a line containing two endpoints |
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| part of a line containing one endpoint |
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| A point that bounds a segment. |
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| Two rays that extend in opposite directions. |
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| the set of points the figures have in common. |
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| rules that are accepted without proof |
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| real number that corresponds to a point on a numberline |
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| the length between two points |
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| distance between two points |
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| the middle of three collinear points |
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| two rays that share an initial point |
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| the common initial point on an angle |
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| a point between two rays of an angle |
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| a point outside the rays of an angle |
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| an angle measuring between 0 and 90 degrees |
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| an angle measuring between 90 and 180 degrees |
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| two angles with a common ray |
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| a point exactly in the middle of a segment |
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| to cut into two congruent pieces |
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| geometry tool used to draw arcs |
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| geometry tool used to draw straight lines |
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| a geometry diagram drawn with a compass and a straightedge |
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| tool used to measure angles |
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| a ray what divides an angle into two congruent pieces |
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| two opposite congruent angles formed by a pair of intersecting lines |
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| two adjacent angles whose non-common sides are opposite rays |
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| two angles that add to 90 degrees |
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| two angles that add to 180 degrees |
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| the amount of space inside a figure |
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| the distance around a figure |
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| the distance around a circle |
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| Greek author of the first Geometry textbook, 300 BC |
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| the first Geometry book, over 2300 years old |
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