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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. 1 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 2 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. 3 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. 4 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. 5 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. 6 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. 7 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. 8 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. 9