vocabulary words
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| acute angle | less than 90 degrees.
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| angle | two rays that are connected at the end point. The end point is called the vertex.
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| angle bisector | ray that divides an angle into 2 congruent (=) angles.
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| collinear points | points that lie on the same line are collinear points.
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| congruent angles | angles that have the same measures.
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| congruent segments | two segments with the same length.
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| conjecture | a conclusion reached by using inductive reasoning.
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| coordinate | the distance and direction from the origin of a number line.
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| coplanar | points and lines in the same plane are coplanar.
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| counterexample | a particular example or instance of the statement that makes the statement false.
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| inductive reasoning | a type of reasoning that reaches conclusions based on a pattern of specific examples or past events.
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| line | a line has length but no width or thickness. It extends without end in two directions.
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| midpoint | a point that divides a segment into two congruent segments. it bisects the segment.
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| obtuse angle | more than 90 degrees.
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| opposite rays | opposite rays start at the same point and goes on in the same direction.
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| parallel lines | parallel lines are coplanar lines that do not intersect.
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| perpendicular lines | perpendicular lines that intersect to form right angles.
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| plane | a plane is a flat surface that has no thickness. it extends without end in all directions.
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| point | a point has no length, width, or thickness, but has a position. (location)
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| postulate | a statement accepted to be true without proof.
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| ray | a ray is a part of a line that consists of an initial point and all points on the line that lie on one side of the initial point.
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| right angle | exactly 90 degrees.
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| segment | a line segment is a portion of a line between two points called end points.
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| skew lines | skew lines are noncoplanar lines. therefore, they are not parallel and do not intersect.
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| space | space is the boundless three dimensional set of all points.
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