##### Vocabulary Geometry

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created 7 years ago by fmarlatt
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These terms compliment the Pearson enVision math series for fourth grade
updated 5 years ago by fmarlatt
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1

point

an exact location in space

2

acute angle

an angle that is less than 90 degrees and smaller than a right angle

3

Hexagon

a polygon with 6 sides and 6 vertices

4

intersecting lines

the 2 line segments cross each other at a point

5

parallel lines

lines that are equal distance apart at every point and they never intersect
The strips on the monarch caterpillar are parallel.

6

symmetric
symmetrical
lines of symmetry

a figure is symmetric if it can be folded into 2 congruent halves that fit on top of each other. The line of symmetry divides the valentine heart into 2 congruent shapes.

7

line

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

8

plane

an endless flat surface

9

perpendicular lines

2 lines that intersect at a right angle

10

line segment

part of a line that has 2 end points

11

ray

part of a line that has 1 end point and extends forever in one direction

12

angle

a figure formed by 2 rays that have the same endpoint

13

right angle

an angle that measures exactly 90º

14

obtuse angle

and angle that measures more than 90º

15

straight angle

an angle that measures exactly 180º

16

polygon

a closed shape made up of line segments

17

side

each of the line segments of a polygon

18

vertex, vertices

the point where 2 rays meet to form an angle. the points where the sides of a polygon meet.

19

triangle

a polygon with 3 sides and 3 angles

20

a polygon with 4 sides and 4 angles

21

pentagon

a polygon with 5 sides and 5 angles

22

octagon

a polygon with 8 sides and 8 angles

23

parallelogram

a quadrilateral in which the opposite sides are parallel

24

rectangle

a parallelogram with 4 right angles

25

square

a parallelogram with 4 right angles and all sides the same length

26

rhombus

a parallelogram with all sides the same length

27

trapezoid

a quadrilateral with only 1 pair of opposite sides that are parallel

28

equilateral triangle

a triangle with 3 equal sides

29

isosceles triangle

a triangle that has 2 equal sides

30

scalene triangle

a triangle that has no sides that as the same length

31

right triangle

a triangle with 1 right angle

32

acute triangle

a triangle with 3 acute angles

33

obtuse triangle

a triangle with one obtuse angle

34

congruent

2 shapes that are the same shape and the same size

35

similar

2 shapes that are the same shape but not the same size

36

classify

To arrange in groups, by some property.

These shapes are classified by the number of sides.

37

ellipse

a 2 dimensional shape that resembles a flatten circle
An ellipse has only 2 lines of symmetry

38

equiangular

39

two dimensional

a shape that has height and width but no depth, Squares, Circles, Triangles, etc are two dimensional objects

40

congruent polygons

2 polygons that are the same shape and same size

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