# Shared Flashcard Set

## Details

chapter 1
geomtry
30
Mathematics
01/28/2010

Term
 inductive reasoning
Definition
 reasoning based on patterns you observe
Term
 counterexample
Definition
 is an an example for which the conjecture is incorrect
Term
 point
Definition
 is a location represented by a small dot an a capital letter
Term
 space
Definition
 set of all points
Term
 line
Definition
 extends in two opposite directions without end
Term
 collinear point
Definition
 points the lie on the same line
Term
 plane
Definition
 is a flat surface that has no thickness contains many lines and extends in all dirctions without end
Term
 coplanar
Definition
 points and lines on the same plane
Term
 postulate(axiom)
Definition
 accepted statement of fact
Term
 postulate 1
Definition
 through any two points there is exactly one line
Term
 postulate 2
Definition
 if two lines intersect then they intersect at exacly one point
Term
 postulate 3
Definition
 if two planes intersect then they intersect in exacly one line
Term
 postulate 4
Definition
 through any three non collinear points there is exactly one plane
Term
 segment
Definition
 is the part of a line consisting of two endpoints and all points between them
Term
 ray
Definition
 is the line consisting of one endpoint and all the points of the line on one side of the endpoint
Term
 opposite rays
Definition
 two collinear rays with the same endpoint opposite rays always form a line
Term
 parallel lines
Definition
 are coplaner lines that dont intersect
Term
 skrew lines
Definition
 are noncoplaner not parallel and do not intersect
Term
 parallel planes
Definition
 are planes that dont intersect
Term
 congruent segments
Definition
 two segments with the same length
Term
 midpoint
Definition
 is a point that divides a segment into congruent segments
Term
 acute angles
Definition
 less than 90 degrees
Term
 right angle
Definition
 exacly 90 degrees
Term
 obtuse angle
Definition
 more than 90 degrees less than 180 degrees
Term
 straight line
Definition
 exacly 180 degrees
Term
 congruent angles
Definition
 angles with the same measure
Term
 straightedge
Definition
 a ruler with no markings
Term
 perpendicular lines
Definition
 two lines that intersect to form right angles
Term
 perpendicular bisector
Definition
 line,segment,or ray that is perpendiular to the segment at its midpoint bisecting the segment into two congruent segments
Term
 angle bisector
Definition
 is a ray that divides anangle into two congruent coplanar angles its enpoint is at the angle vertex
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