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1 Cakes and Pancakes Translating and Stacking Two-Dimensional Figures.2 Learning Goals In this lesson, you will: Apply translations to two-dimensional plane figures to create three-dimensional solids. Describe three-dimensional solids formed by translations of plane figures through space. Build three-dimensional solids by stacking congruent or similar two-dimensional plane figures. Key Terms isometric paper right triangular prism oblique triangular prism right rectangular prism oblique rectangular prism right cylinder oblique cylinder You may never have heard of isometric projection before, but you have probably seen something like it many times when playing video games. Isometric projection is used to give the environment in a video game a threedimensional effect by rotating the visuals and by drawing items on the screen using angles of perspective. One of the first uses of isometric graphics was in the video game Q*bert, released in The game involved an isometric pyramid of cubes. The main character, Q*bert, starts the game at the top of the pyramid and moves diagonally from cube to cube, causing them to change color. Each level is cleared when all of the cubes change color. Of course, Q*bert is chased by several enemies. While it may seem simple now, it was extremely popular at the time. Q*bert had his own line of toys, and even his own animated television show! 781
2 Problem 1 These Figures Take the Cake You can translate a two-dimensional figure through space to create a model of a three-dimensional figure. 1. Suppose you and your classmate want to design a cake with triangular bases. You can imagine that the bottom triangular base is translated straight up to create the top triangular base. Recall that a translation is a transformation that slides each point of a figure the same distance in the same direction. a. What is the shape of each lateral face of this polyhedron formed by this translation? b. What is the name of the solid formed by this translation? A two-dimensional representation of a triangular prism can be obtained by translating a triangle in two dimensions and connecting corresponding vertices. You can use isometric paper, or dot paper, to create a two-dimensional representation of a three-dimensional figure. Engineers often use isometric drawings to show three-dimensional diagrams on two-dimensional paper. 782 Chapter Three-Dimensional Figures
3 2. Translate each triangle to create a second triangle. Use dashed line segments to connect the corresponding vertices. a. Translate this triangle in a diagonal direction. b. Translate this right triangle in a diagonal direction. c. Translate this triangle vertically. d. Translate this triangle horizontally. 3. What do you notice about the relationship among the line segments connecting the vertices in each of your drawings?.2 Translating and Stacking Two-Dimensional Figures 783
4 When you translate a triangle through space in a direction that is perpendicular to the plane containing the triangle, the solid formed is a right triangular prism. The triangular prism cake that you and your classmate created in Question 1 is an example of a right triangular prism. When you translate a triangle through space in a direction that is not perpendicular to the plane containing the triangle, the solid formed is an oblique triangular prism. An example of an oblique triangular prism is shown. 4. What is the shape of each lateral face of an oblique triangular prism? 5. Suppose you and your classmate want to design a cake with rectangular bases. You can imagine that the bottom rectangular base is translated straight up to create the top rectangular base. a. What is the shape of each lateral face of the solid figure formed by this translation? b. What is the name of the solid formed by this translation? 784 Chapter Three-Dimensional Figures
5 A two-dimensional representation of a rectangular prism can be obtained by translating a rectangle in two dimensions and connecting corresponding vertices. 6. Draw a rectangle and translate it in a diagonal direction to create a second rectangle. Use dashed line segments to connect the corresponding vertices. 7. Analyze your drawing. a. What do you notice about the relationship among the line segments connecting the vertices in the drawing? b. What is the name of a rectangular prism that has all congruent sides? c. What two-dimensional figure would you translate to create a rectangular prism with all congruent sides? What other shapes can I translate to create three-dimensional figures? d. Sketch an example of a rectangular prism with all congruent sides..2 Translating and Stacking Two-Dimensional Figures 785
6 When you translate a rectangle through space in a direction that is perpendicular to the plane containing the rectangle, the solid formed is a right rectangular prism. The rectangular prism cake that you and your classmate created in Question 8 is an example of a right rectangular prism. When you translate a rectangle through space in a direction that is not perpendicular to the plane containing the rectangle, the solid formed is an oblique rectangular prism. 8. What shape would each lateral face of an oblique rectangular prism be? 9. Sketch an oblique rectangular prism. 10. Suppose you and your classmate want to design a cake with circular bases. You can imagine that the bottom circular base, a disc, is translated straight up to create the top circular base. a. What shape would the lateral face of the solid figure formed by this translation be? b. What is the name of the solid formed by this translation? 786 Chapter Three-Dimensional Figures
7 A two-dimensional representation of a cylinder can be obtained by translating an oval in two dimensions and connecting the tops and bottoms of the ovals.. Translate the oval in a diagonal direction to create a second oval. Use dashed line segments to connect the tops and bottoms of the ovals. The bases of a cylinder are really circles but look like ovals when you draw them. 12. What do you notice about the relationship among the line segments in the drawing? When you translate a disc through space in a direction that is perpendicular to the plane containing the disc, the solid formed is a right cylinder. The cylinder cake that you and your classmate created in Question 13 is an example of a right cylinder. When you translate a disc through space in a direction that is not perpendicular to the plane containing the disc, the solid formed is an oblique cylinder. 13. What shape would the lateral face of an oblique cylinder be? 14. Sketch an oblique cylinder..2 Translating and Stacking Two-Dimensional Figures 787
8 Problem 2 Congruent and Similar The math club at school is planning a pancake breakfast as a fund-raiser. Because this is a fund-raiser for the math club, the pancakes will use various geometric shapes! 1. Imagine you stack congruent circular pancakes on top of each other. Remember, similar figures have the same shape. Congruent figures have the same shape AND size. Pancake a. What is the name of the solid formed by this stack of pancakes? b. Relate the dimensions of a single circular pancake to the dimensions of this solid. 2. Imagine you stack congruent square pancakes on top of each other. Pancake a. What is the name of the solid formed by this stack of pancakes? b. Relate the dimensions of a single square to the dimensions of this solid. 788 Chapter Three-Dimensional Figures
9 3. Imagine you stack congruent triangular pancakes on top of each other. Pancake a. What is the name of the solid formed by this stack of pancakes? b. Relate the dimensions of the triangle to the dimensions of this solid. 4. What do you notice about the three-dimensional solids created by stacking congruent figures? 5. What type of solid would be formed by stacking congruent rectangles? pentagons? hexagons?.2 Translating and Stacking Two-Dimensional Figures 789
10 6. Imagine you stack similar circular pancakes on top of each other so that each layer of the stack is composed of a slightly smaller pancake than the previous layer. a. What is the name of the solid formed by this stack of pancakes? b. Relate the dimensions of a single pancake to the dimensions of the solid. 7. Imagine you stack similar square pancakes on top of each other so that each layer of the stack is composed of a slightly smaller pancake than the previous layer. a. What is the name of the solid formed by this stack of pancakes? b. Relate the dimensions of a single pancake to the dimensions of the solid. 8. Imagine you stack similar triangular pancakes on top of each other so that each layer of the stack is composed of a slightly smaller pancake than the previous layer. a. What is the name of the solid formed by this stack of pancakes? b. Relate the dimensions of a single pancake to the dimensions of the solid. 790 Chapter Three-Dimensional Figures
11 9. What do you notice about the three-dimensional solids created by stacking similar figures? 10. What type of solid would be formed by stacking similar rectangles? pentagons? hexagons?. Use what you have learned in this lesson to make an informal argument that explains the volume formulas for prisms and cylinders. 12. Complete the graphic organizer to record the volume formulas and the transformations you have used to create the solid figures..2 Translating and Stacking Two-Dimensional Figures 791
12 Transformations: Prisms V 5 (area of base) 3 height V 5 Bh Pyramids V Bh Transformations: Cylinders Volume Formulas and Transformations Cones V 5 pr 2 h V pr2 h Transformations: Transformations: 792 Chapter Three-Dimensional Figures
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Someone else might choose to describe the closet by determining how many square tiles it would take to cover the floor. 6 ft.
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Key Concept Euler s Formula
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STATE GOAL 6: NUMBER SENSE Demonstrate and apply a knowledge and sense of numbers, including numeration and operations (addition, subtraction, multiplication, division), patterns, ratios and proportions.
Houghton Mifflin Math Expressions Grade 3 correlated to Illinois Mathematics Assessment Framework
STATE GOAL 6: NUMBER SENSE Demonstrate and apply a knowledge and sense of numbers, including numeration and operations (addition, subtraction, multiplication, division), patterns, ratios and proportions.
Houghton Mifflin Math Expressions Grade 2 correlated to Illinois Mathematics Assessment Framework
STATE GOAL 6: NUMBER SENSE Demonstrate and apply a knowledge and sense of numbers, including numeration and operations (addition, subtraction, multiplication, division), patterns, ratios and proportions.
A prism s base shape is used to name the solid figure. The base shape of this prism is a triangle. The prism is a triangular prism.
Name Three-Dimensional Figures Essential Question How can you identify, describe, and classify three-dimensional figures? Lesson 11.4 Measurement and Data 5.MD.C.3 MATHEMATICAL PRACTICES MP6, MP7 Unlock