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NAME__________________________
Scott Foresman – Addison Wesley Math
Grade 3
Vocabulary Chapter 8
solid figure
(p. 428) A figure that has length, width and height.
sphere
(p. 428) A solid figure in the shape of a ball.
cube
(p. 428) A solid figure with six faces that are congruent
squares.
rectangular prism
(p. 446) A solid figure with faces that are rectangles.
pyramid
(p. 428) A solid figure whose base is a polygon and whose
faces are triangles with a common point.
cone
(p. 428) A solid figure with a circle as its base and a curved
surface that meets at a point.
cylinder
(p. 428) A solid figure with two congruent circles as bases.
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NAME__________________________
Scott Foresman – Addison Wesley Math
Grade 3
Vocabulary Chapter 8
face
(p. 432) A flat surface of a solid that does not roll.
face
edge
(p. 432) A line segment where two faces of a solid figure
meet.
edge
corner
(p. 432) Where three or more edges meet in a solid figure.
Corner or vertex
vertex (pl. vertices)
(p. 432, 444, 446) The point where two rays meet to form an
angle. The points where the sides of a polygon meet. The
points where three or more edges meet in a solid figure.
vertex
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NAME__________________________
Scott Foresman – Addison Wesley Math
Grade 3
Vocabulary Chapter 8
point
(p. 428) An exact position often marked by a dot.
point
line
(p. 442) A straight path of points that is endless in both
directions.
line segment
(p. 442) A part of a line that has two endpoints.
ray
(p. 442) A part of a line that has one endpoint and continues
endlessly in one direction.
intersecting lines
(p. 442) Lines that cross at one point.
parallel lines
(p. 442) Lines that never intersect.
angle
(p. 444) A figure formed by two rays that have the same
endpoint.
right angle
(p. 444) An angle that forms a square corner.
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NAME__________________________
Scott Foresman – Addison Wesley Math
Grade 3
Vocabulary Chapter 8
acute angle
(p. 444) An angle that measures less than a right angle.
obtuse angle
(p. 444) An angle that measures more than a right angle.
perpendicular lines
(p. 444) Two lines that intersect to form right angles.
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NAME__________________________
Scott Foresman – Addison Wesley Math
Grade 3
Vocabulary Chapter 8
polygon
side
(p. 446) A closed figure made up of straight line segments
(p. 446) A line segment forming part of a polygon.
side
triangle
(p. 446) a polygon with three sides.
quadrilateral
(p. 446) A polygon with four sides.
pentagon
(p. 446) polygon with five sides.
hexagon
(p. 446) A polygon with six sides.
octagon
(p. 446) a polygon with eight sides.
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NAME__________________________
Scott Foresman – Addison Wesley Math
Grade 3
Vocabulary Chapter 8
equilateral triangle
(p. 450) A triangle with all sides the same length.
isosceles triangle
(p. 450) A triangle with at least two sides the same length.
scalene triangle
(p. 450) A triangle with no sides the same length.
acute triangle
(p. 450) A triangle with three acute angles.
obtuse triangle
(p. 450) A triangle with one obtuse angle.
right triangle
A triangle with one right angle.
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NAME__________________________
Scott Foresman – Addison Wesley Math
Grade 3
Vocabulary Chapter 8
square
(p. 428) A quadrilateral with four right angles and all sides
the same length.
rectangle
(p. 454) A quadrilateral with four right angles.
parallelogram
(p. 454) A quadrilateral in which opposite sides are parallel
rhombus
(p. 454) A quadrilateral with opposite sides parallel and all
sides the same length.
trapezoid
(p. 454) A quadrilateral with only one pair of parallel lines.
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NAME__________________________
Scott Foresman – Addison Wesley Math
Grade 3
Vocabulary Chapter 8
flip (reflection)
(p. 456) The change in the position of a figure that is the
result of picking it up and turning it over.
congruent figures
(p. 450) Figures that have the same shape and same size.
slide (translate)
(p. 457) The change in the position of a figure that moves it
up, down or sideways.
turn (rotate)
(p. 457) The change in position of a figure that moves it
around a point.
symmetry
(p. 428) A figure has symmetry if it can be folded along a
line so that both parts match exactly.
line of symmetry
(p. 460) A line on which a figure can be folded so that both
parts match exactly.
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NAME__________________________
Scott Foresman – Addison Wesley Math
Grade 3
Vocabulary Chapter 8
perimeter
(p. 464) The distance around a figure.
5 in.
2 in.
2 in.
5 in.
Perimeter: 5 + 2 + 5 + 2 = 14 inches.
square unit
(p. 468) A square with sides one unit long used to measure
area
1 cm
1 cm
1 cm
1 cm
area
(p. 468) The number of square units needed to cover a
region.
2 cm
4 cm
Area: 2 cm x 4 cm = 8 square cm or 8 cm2
cubic unit
(p. 472) A cube with edges one unit long used to measure
volume.
Example: 1 inch
volume
(p. 472) The number of cubic units need to fill a solid figure.
If the Rubric’s Cube has nine cubes in the top level, nine cubes in the
middle level and nine cubes in the lower level. The volume of the Rubrics
cube would be 27 cubic units or 27 units3.
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