Vocabulary Geometry

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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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4th grade
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1

point

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an exact location in space

2

acute angle

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

3

Hexagon

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a polygon with 6 sides and 6 vertices

4

intersecting lines

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the 2 line segments cross each other at a point

5

parallel lines

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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

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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

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

8

plane

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an endless flat surface

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perpendicular lines

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2 lines that intersect at a right angle

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line segment

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part of a line that has 2 end points

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ray

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

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angle

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a figure formed by 2 rays that have the same endpoint

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right angle

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an angle that measures exactly 90º

14

obtuse angle

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and angle that measures more than 90º

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straight angle

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an angle that measures exactly 180º

16

polygon

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a closed shape made up of line segments

17

side

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each of the line segments of a polygon

18

vertex, vertices

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

19

triangle

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a polygon with 3 sides and 3 angles

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quadrilateral

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a polygon with 4 sides and 4 angles

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pentagon

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a polygon with 5 sides and 5 angles

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octagon

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a polygon with 8 sides and 8 angles

23

parallelogram

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a quadrilateral in which the opposite sides are parallel

24

rectangle

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a parallelogram with 4 right angles

25

square

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

26

rhombus

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a parallelogram with all sides the same length

27

trapezoid

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

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equilateral triangle

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a triangle with 3 equal sides

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isosceles triangle

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a triangle that has 2 equal sides

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scalene triangle

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a triangle that has no sides that as the same length

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right triangle

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a triangle with 1 right angle

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acute triangle

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a triangle with 3 acute angles

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obtuse triangle

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a triangle with one obtuse angle

34

congruent

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2 shapes that are the same shape and the same size

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similar

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

36

classify

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To arrange in groups, by some property.

These shapes are classified by the number of sides.

37

ellipse

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

38

equiangular

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39

two dimensional

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

40

congruent polygons

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2 polygons that are the same shape and same size


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