Ecs 6Th Ch. 7 Math Vocab

Front 1

quadrilateral

Back 1

4 sides and 4 angles

Front 2

parallelogram

Back 2

opposite sides are
parallel and
congruent

Front 3

rectangle

Back 3

a parallelogram with
4 right angles

Front 4

rhombus

Back 4

a parallelogram with
4 congruent sides

Front 5

square

Back 5

a special rectangle with all
sides congruent,
a special rhombus with four
right angles

Front 6

trapezoid

Back 6

has exactly one pair
of parallel sides

Front 7

congruent

Back 7

having the same
size and shape

Front 8

corresponding
sides

Back 8

matching sides of
two or more
polygons

Front 9

transformation

Back 9

moves a figure
without changing its
shape or size

Front 10

translation

Back 10

movement of a
figure along a
straight line

Front 11

rotation

Back 11

movement of a
figure around a
point

Front 12

reflection

Back 12

flips a figure over a
line, creating a mirror
image

Front 13

line of
reflection

Back 13

a line that a figure is
flipped across to
create a
mirror-image

Front 14

polygon

Back 14

a closed plane figure
made up of several
line segments

Front 15

triangle

Back 15

a polygon with 3 sides
and 3 angles

Front 16

quadrilateral

Back 16

a polygon with 4 sides
and 4 angles

Front 17

pentagon

Back 17

a polygon with 5 sides
and 5 angles

Front 18

hexagon

Back 18

a polygon with 6 sides
and 6 angles

Front 19

octagon

Back 19

a polygon with 8 sides
and 8 angles

Front 20

regular
polygon

Back 20

a polygon in which all
the angles are
congruent and all
the sides are
congruent

Front 21

right triangle

Back 21

a triangle with a right
angle

Front 22

acute
triangle

Back 22

a triangle with ALL
acute angles

Front 23

obtuse
triangle

Back 23

a triangle with an
obtuse angle

Front 24

equilateral
triangle

Back 24

a triangle with 3
equal sides

Front 25

isosceles
triangle

Back 25

a triangle with at
least 2 equal sides

Front 26

scalene
triangle

Back 26

a triangle with 3
unequal sides

Front 27

congruent
angles

Back 27

angles that have the
same angle measure

Front 28

vertical
angles

Back 28

pair of opposite
congruent angles
formed by
intersecting lines

Front 29

adjacent
angles

Back 29

two angles that share
both a side and a
vertex

Front 30

complementary
angles

Back 30

two angles whose
sum is exactly 90 degrees

Front 31

supplementary
angles

Back 31

two angles whose
sum is exactly 180 degrees

Front 32

intersecting
line

Back 32

lines that cross at one
common point

Front 33

parallel
line

Back 33

lines in the same
plane that never
intersect

Front 34

perpendicular
line

Back 34

lines that intersect
and form right angles

Front 35

skew
line

Back 35

lines that are not in
the same plane and
do not intersect

Front 36

point

Back 36

an exact location

Front 37

line

Back 37

a straight path that
extends without end
in opposite directions

Front 38

plane

Back 38

a flat surface that
extends without end
in opposite directions

Front 39

line segment

Back 39

made of two
endpoints and all the
points between the
endpoints

Front 40

ray

Back 40

has one endpoint,
then extends without
end in one direction
only

Front 41

angle

Back 41

formed by two line
segments with a
common endpoint

Front 42

vertex

Back 42

the point of an angle
where two sides
intersect

Front 43

protractor

Back 43

a device for
measuring angles

Front 44

right angle

Back 44

an angle that
measures exactly
90 degrees

Front 45

acute angle

Back 45

an angle that
measures less than
90 degrees

Front 46

obtuse angle

Back 46

an angle that
measures more than
90 degrees but less than 180 degrees

Front 47

straight angle

Back 47

an angle that
measures exactly
180 degrees