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33 Cards in this Set
- Front
- Back
Conjecture
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An unproven statement that is based on observations
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Inductive Reasoning
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A process that includes looking for patterns and making conjectures
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Counterexample
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An example that shows a conjecture is false
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Three Undefined Terms in Geometry
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Line, point, plane
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Point
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Has no dimensions, represented by a small dot
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Line
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No width, extends infinitly in both directions
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Plane
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Has no thickness, extends indefinitely in all directions.
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Collinear Points
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Points that lie on the same line
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Coplaner Points
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Points that lie on the same plane
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Line Segment, Endpoint
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Part of a line that consists of two points called endpoints and all points on the line between it's endpoints
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Ray, Initial Point
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Part of a line that consists of an initial point and all points on the line that extend in one direction
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Opposite Rays
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If C is between A&B (ABC=collinear) then line CA and line CB are opposite rays
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Intersect
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To have one or more points in common
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Intersection
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The set of points that two or more geometric figures have in common
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Space
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The set of all points
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Postulates
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Rules that are excepted without proof
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Coordinate
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The real numbers that correspond to a point on a line
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Distance
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the absolute value of difference between two coordinates
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Length
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The distance between the two endpoints on a line segment
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Between
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When three points are collinear you can say that one is between the other two
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Distance formula
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d= square root (x2-x1)^2+(y2-y1)^2
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Congruent segments
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Two sements that have the same length
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Angle
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Consists of two different rays having the same initial point
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Know the sides and vertex of an angle
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Congruent angles
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Two angles that have the same measure
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Measure of an angle
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Found using a protractor
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Interior of an angle
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Any point inside the angle
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Exterior of an angle
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Outside the angle
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Acute angle
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Angle less than 90 degrees
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Right Angle
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90 degrees angle
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Obtuse angle
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Over 90 degrees
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Straight angle
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180 degrees
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Adjacent angles
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Two angles w/ a common vertex and side but no common interception points
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