1.2-1.5 Flashcards
has a location and no size, represented by a dot
point
a straight path that has no thickness and extends forever
line
a flat surface that has no thickness and extends forever
plane
points that lie on the same line are
collinear
points that lie on the same plane are
coplanar
a part of a line consisting of two points and all points between them
line segment
the beginning and end of a line segment, or the beginning of a ray
endpoints
a part of a line that starts at one endpoint and extends forever in one direction
ray
two rays with a common endpoint that form a line
opposite rays
a math rule that is accepted as true
postulate, or axiom
the length between any two points with coordinates a and b is found by the equation
|a-b|=AB
segments that have the same length
congruent segments
a point in the middle of a segment
midpoint
Segment addition postulate formula
AB+BC=AC
a segment, line, point, plane, etc that cuts a segment in half
bisector
an angle is formed by two rays called
sides
angles common endpoint is called the
vertex
two coplanar angles with a common vertex and a common side, but no interior points in common
Adjacent
A pair of adjacent angles whose noncommon sides are opposite rays
linear pair
two angles whose measures add up to 90
complementary
two angles whos measures add up to 180
supplementary
midpoint formula
(x1+x2)/2 , (y1+y2)/2
Distance formula
(x2-x1)^2 , (y2-y1)^2
complement of a 40 degree angle
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