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Chapter 1 geometry vocab
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Terms in this set (27)
segment bisector
a segment, ray, line, or plane that intersects a segment at its midpoint
Line
Extends forever in 2 directions. Names by 2 capitol letters or 1 lower case.
Point
The simplest figure studied in geometry. Usually named by caption letters.
Plane
Extends forever without ending and has no thickness (2D)
Space
the set of all points
collinear points
points on the same line
coplanar points
points on the same plane
endpoint
Point at which a line segment or a rat ends
Ray
A part of a line, with one endpoint, that continues without end in one direction
opposite rays
two rays that have a common endpoint and form a line
intersection
the point at which two lines or roads meet and cut across each other
Endpoint formula
double the midpoint and subtract the endpoint
point slope form
y-y1=m(x-x1)
Angle Addition Postulate
If P is in the interior of <RST, then m<RSP + m<PST = m<RST
Axiom
a universal truth; an established rule
supplementary angles
Two angles whose sum is 180 degrees
complementary angles
Two angles whose sum is 90 degrees
Linear pair
A pair of adjacent angles whose noncommon sides are opposite rays.
postulate
a statement that is accepted as true without proof
straight angle
an angle that measures 180 degrees
right angle
an angle that measures 90 degrees
vertical angles
A pair of opposite congruent angles formed by intersecting lines
vertex
A point where two or more straight lines meet.
Midpoints
the point halfway between the endpoints
undifined terms
point, line, plane
line segment
part of a line with two endpoints
congruent segments
segments that have the same length
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