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20 Cards in this Set
- Front
- Back
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conjecture
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an unproven statement that is based on observations.
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Point
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No dimension. Usually represented by a small dot.
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Line
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Extends in one dimension. Represented by a straight line with two arrowheads.
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Plane
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Extends in two dimensions. Represented by a shape that looks like a wall.
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Segment
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Part of a line that consists of two points, called endpoint, and all points on the line that are between endpoints.
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Ray
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Part of a line that consists of a point, called an initial point, and all points on the line that extend in one direction.
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Postulate (axioms)
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Rules that are accpeted without proof.
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Length of a segment
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The distance between the endpoints of a segment. The distance between Aand B is written as AB, which is also called length of segment AB.
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Congruent Segments
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Segments that have the same length. Segments are congruent: segment AB "is congruent to" segment AD.
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Congruent Angles
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Angles that have the same measure. For example, angle BAC and angle DEF each have a measure of 50 degrees, so they are congruent. angle BAC "is congruent to" angle DEF.
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acute angle
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An angle with measure between 0 degrees and 90 degrees.
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right angle
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An angle with measure equal to 90 degrees.
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obtuse angle
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An angle with measure between 90 degrees and 180 degrees.
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straight angle
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An angle with measure equal to 180 degrees.
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Segment Bisector
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A segment, ray, line, or plane that intersects a segment at its midpoint.
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Angle Bisector
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A ray that divides an angle into two adjacent angles that are congruent.
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Vertical Angles
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Two angles whose sides form two pairs of opposite rays.
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Complementary angles
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Two angles whose measures have the sum of 90 degrees.
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Supplementary angles
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Two angles whose measures have the sum of 180 degrees.
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Inductive Reasoning
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Looking for patterns and making conjectures is part of a process.
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