point
formed by two rays, lines, or
segments that come together
at a vertex; named with three
letters
line
angle with measure
less than 90 degrees
ray
angle with measure
of 90 degrees
line segment
angle with measure greater
than 90 degrees but less
than 180 degrees
plane
angle with measure
of 180 degrees
congruent
two angles that add
up to 90 degrees
angle
names an exact
location; named with
one letter
acute angle*
never-ending straight
path; named with two
letters
right angle*
part of a line with one
endpoint that goes on forever
in one direction; named with
two letters
obtuse angle*
part of a line with two
endpoints; named
with two letters
straight angle
flat surface that
extends forever in all
directions
complementary
angles*
same or
equal
supplementary
angles*
any line that
intersects two or
more lines
vertical
angles
2 angles that are on the same
side of the transversal and
the parallel lines
perpendicular
lines*
set of points that are
equal distance from a
central point
parallel lines*
segment from center
of a circle to a point
on the circle
skew lines
segment with endpoints
on the circle that passes
through the center
adjacent
angles
a segment with
endpoints on the
circle
transversal
two angles that add
up to 180 degrees
corresponding
angles
angles formed by two
intersecting lines. They share
a vertex but not a common
side.
circle
lines that intersect
and form right angles
radius
lines on the same
plane that will never
intersect
diameter
lines that will never
touch because they are
on different planes
chord
angles that are next to each
other and share a vertex
and a common side
arc
triangle with one
obtuse angle
central angle
triangle with three
acute angles
sector
triangle with two
congruent sides
polygon
triangle with three
congruent sides
regular
polygon
triangle with no
congruent sides
right triangle
quadrilateral with
opposite congruent
and parallel sides
obtuse
triangle
piece of a
circle
acute triangle
angle formed
by two radii
isosceles
triangle*
part of a circle
enclosed by two radii
and an arc
equilateral
triangle*
closed shape made
up of at least three
straight sides
scalene
triangle*
polygon with equal
sides and equal
angles
parallelogram
triangle with
one right angle
square
turn
rhombus
slide
rectangle
when a figure can be
divided in half by a line
to form a mirror image
trapezoid
when a figure can be turned
to match up with itself before
a 360 degree turn
transformation
reflection
rotation
parallelogram with 4
right angles and 4
congruent sides
translation
parallelogram with
4 congruent sides
line symmetry
parallelogram with
4 right angles
rotational
symmetry
quadrilateral with one
set of opposite
parallel sides
change in the
position or size of a
figure
flip (mirror
image)