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16 terms

Geometry Flashcards

STUDY
PLAY
vertex
The common endpoint of an angle
perpendicular
two lines that intersect to form right angles
parallel
lines that never intersect
ray
part of a line with one endpoint
line
extends forever in both directions
line segment
part of a line with two endpoints
acute angle
an angle that measures less than 90 degrees
obtuse angle
An angle that measures more than 90 degrees but less than 180 degrees
intersecting line
when 2 lines cross each other
right angle
an angle that measures exactly 90 degrees
straight angle
an angle that measures 180 degrees
perimeter
the distance around a figure.
vertical line
A line that goes up and down
horizontal line
a line that going from SIDE TO SIDE
area
the space inside a shape
symmetry
balance, same on both sides