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chapter 1
geometry
28
Mathematics
9th Grade
01/28/2010

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Cards

Term
point
Definition
is the location usually represented by a dot or a capital letter
Term
line
Definition
has two arrows, one at each indicate that it extends infinitely in each direction
Term
postulate
Definition
is an accepted statement of fact
Term
1st postulate
Definition
through any 2 points there is exactly 1 line
Term
2nd postulate
Definition
two lines intersect at exactly one point
Term
3rd postulate
Definition
two planes intersect at exactly one line
Term
4th postulate
Definition
through any three noncollinear points there is exactly one plane
Term
space
Definition
a boundless three dimensional set of all points
Term
ray
Definition
has exactly one endpoint and extends infinitely in one direction
Term
opposite rays
Definition
rays that are going in the opposite direction
Term
parallel lines
Definition
two more lines that extend infinitely in both directions and never intersect
Term
skew lines
Definition
lines that are neither parallel nor perpendicular and lie in different planes
Term
parallel planes
Definition
planes that do not intersect
Term
line segment
Definition
is a part of a line
Term
exact answer
Definition
uses pie in the answer
Term
approximate answer
Definition
use pie in the calculator
Term
segment addition postulate
Definition
little piece+little piece=big piece
Term
congruent segments
Definition
segments that have the same measure
Term
segment bisector
Definition
a line segment or ray that goes through a segment and divides it into two smaller congruent segments
Term
acute angle
Definition
>90degrees
Term
abtuse angle
Definition
<90degrees
Term
right angle
Definition
=90degrees
Term
straight angle
Definition
an angle that measures exactly 180 degrees
Term
congruent angles
Definition
two angles that have the same measure
Term
angle addition postulate
Definition
little angle+little angle=big angle
Term
angle bisector
Definition
divides an angle into two smaller, congruent angles
Term
perpendicular lines
Definition
two lines that intersect to form right angles
Term
perpendicular bisector
Definition
a line segment or ray that is perpendicular to the segment aat its midpoint
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