Geometry 5

Front 1

point

Back 1

an exact location in space

Front 2

line

Back 2

a straight path of points that goes on forever in two directions

Front 3

line segment

Back 3

a part of a line, it has two endpoints

Front 4

midpoint

Back 4

halfway between two endpoints of a line segment

Front 5

ray

Back 5

part of a line; it has one endpoint and extends forever in only one direction

Front 6

plane

Back 6

an endless flat surface

Front 7

angle

Back 7

formed by two rays that have the same endpoint

Front 8

vertex

Back 8

the common endpoint of the two rays of an angle

Front 9

sides

Back 9

the two rays that make up an angle

Front 10

interior

Back 10

the space between the two rays of an angle

Front 11

exterior

Back 11

the space on the outside of two rays of an angle

Front 12

degree

Back 12

the unit of measurement for an angle

Front 13

protractor

Back 13

a device used to measure angles

Front 14

acute angle

Back 14

an angle with a measure between 0 and 90 degrees

Front 15

right angle

Back 15

a 90 degree angle

Front 16

obtuse angle

Back 16

an angle with a measure between 90 and 180 degrees

Front 17

straight angle

Back 17

a 180 degree angle

Front 18

circle

Back 18

a closed plane figure made up of all the points the same distance from the center

Front 19

center

Back 19

a circle is named by its center; the point in the middle of a circle

Front 20

radius

Back 20

any line segment that connects the center to a point on the circle

Front 21

diameter

Back 21

any line segment through the center that connects two points on the circle

Front 22

chord

Back 22

any line segment that connects two points on a circle

Front 23

central angle

Back 23

any angle whose vertex is the center of a circle

Front 24

polygon

Back 24

a closed plane figure made up of line segments

Front 25

triangle

Back 25

a three sided polygon

Front 26

quadrilateral

Back 26

a four sided polygon

Front 27

pentagon

Back 27

a five sided polygon

Front 28

hexagon

Back 28

a six sided polygon

Front 29

octagon

Back 29

an eight sided polygon

Front 30

regular polygon

Back 30

a polygon whose sides are all equal in length

Front 31

equilateral triangle

Back 31

a triangle whose three sides are all equal in length

Front 32

isosceles triangle

Back 32

a triangle with at least two equal sides

Front 33

scalene triangle

Back 33

a triangle with no equal sides

Front 34

right triangle

Back 34

a triangle with one right angle

Front 35

acute triangle

Back 35

a triangle with three acute angles

Front 36

obtuse triangle

Back 36

a triangle with one obtuse angle

Front 37

parallelogram

Back 37

a quadrilateral with both pairs of opposite sides parallel and equal in length

Front 38

rectangle

Back 38

a parallelogram with four right angles

Front 39

square

Back 39

a rectangle with all sides the same lenght

Front 40

trapezoid

Back 40

a quadrilateral with only one pair of parallel sides

Front 41

rhombus

Back 41

a parallelogram with all sides equal in length

Front 42

similar figures

Back 42

figures that have the same shape and proportion

Front 43

congruent figures

Back 43

figures that have the same size and shape

Front 44

transformations

Back 44

a movement of a geometric figure including slides or translations, flip or reflections, and turns or rotations

Front 45

slide (translation)

Back 45

moves a figure in a straight direction

Front 46

flip (reflection)

Back 46

a figure gives its mirror image

Front 47

turn (rotation)

Back 47

moves a figure about a point

Front 48

symmetry

Back 48

a figure can be folded into two congruent parts