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Geometry Vocabulary
Point an exact location in
space
Line A straight path that goes on
forever in both directionsA and B are any 2
points on the line
. B
Ray A straight path that goes on
forever in one direction
Plane A flat surface that goes on forever in
all directions
A straight path that has two
endpoints
Line segment
plane ABC
Starts at A and goes through B
Intersecting lines
Lines that cross at one
point
Perpendicular lines
Lines that cross at right angles
Parallel lines
Lines (in a plane ) that never cross
Angle
Angles
is formed when 2 lines or rays
intersect
Vertex the point where the 2 lines or rays intersect in an
angle
N
B A
C
Acute angle
an angle whose measure is less than 90 degrees
Obtuse angle
an angle whose measure is between 90 and 180 degrees
Straight angle
an angle whose measure is exactly 180 degrees
Right angle
an angle whose measure is exactly 90 degrees
Complementary angles
Two angles whose measures add up to 90 degreesSupplementar
y angles
Two angles whose measures add up to 180 degrees
600
300
1300
500
Vertical angles
Two angles across from each other when 2 lines cross
They are always congruent!
Adjacent angles
Two angles next to each other
They share a side and a vertex
