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Sherwin Midterm
..
24
Mathematics
9th Grade
01/25/2009

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Cards

Term
point
Definition
names a location in space w/o size
Term
line
Definition
straight path w/o thickness that extends forever
Term
plane
Definition
flat surface made up of at least 3 noncolinear points- extends forever
Term
collinear
Definition
points that lie on the same line
Term
coplanar
Definition
points that lie in the same plane
Term
segment
Definition
part of a line consisting between 2 points
Term
endpoint
Definition
a point at one end of a segment or the starting point of a ray
Term
ray
Definition
a part of a line that starts at an endpoint and extends forever
Term
opposite rays
Definition
two rays with a common endpoint that form a line
Term
postulate
Definition
statement accepted as true w/o proof
Term
coordinate
Definition
a number in which a point corresponds to
Term
distance
Definition
absolute value of the difference between the coordinates
Term
length
Definition
the distance between two points
Term
congruent segments
Definition
segments with equal length
Term
between
Definition
if B is between A and C, they must lie on the same line and AB+BC=AC
Term
midpoint
Definition
the point that divides a segment into two congruent segments
Term
angle
Definition
figure formed by 2 rays sharing an endpoint
Term
vertex
Definition
common endpoint of the 2 rays of an angle
Term
vertical angles
Definition
two non-adjacent angles fromed by 2 intersecting lines
Term
perimeter
Definition
sum of the side lengths of a figure
Term
area
Definition
number of non overlapping square units of a given size that exactly cover the figure
Term
height of a triangle
Definition
segment from vertex opposite base which forms a 90 degree angle with the base
Term
diameter
Definition
segement passes through the center of a circle and whose endpoints are on the circle
Term
radius
Definition
segment with endpoints on circle and at center of circle
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