Skeletons of 3-D Shapes
Est. Class Sessions: 2
Students use plastic straws and chenille stems to construct skeletal models of three-dimensional shapes. They also identify the shapes' properties—the number of edges, vertices, and faces—of each shape they build. Then students manipulate their skeletal models to solve problems.
Content in this Lesson
- Describing and analyzing three-dimensional shapes using their properties (e.g., number and shape of sides, number of edges, and number of corners) [E2].
- Identifying and constructing skeletal models of three-dimensional shapes using their properties [E3].
- Identifying congruent faces of shapes [E5].
- Justifying conclusions using geometric properties [E7].
- Using geometric concepts to solve problems.
Daily Practice and Problems W–Z
Materials for Students
| Daily Practice and Problems | Lesson | Homework | Assessment | ||
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Student Books |
Student Guide |
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| Student Activity Book |
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Teacher Resources |
Teacher Guide - digital |
Supplies for Student Groups of Four
90 plastic drinking straws
chenille stems
scissors
Materials for the Teacher
3-D Shape Sort Cards Master (Teacher Guide)
Unit 11 Assessment Record
chart paper
2 sets of Power Solids®
Collection of 3-D Shapes from Lesson 6
Display of Properties of 3-D Shapes chart from Lesson 6
Prepared Skeletal Models. See Materials Preparation.
Display of Edges, Vertices, and Faces Table. See Materials Preparation.
Materials Preparation
Prepare Straws and Chenille Stems. Cut the chenille stems into 2-inch lengths and some of the straws in half. For Part 1, students will use full-length straws. For Part 2, they will use full and half-length straws. To cut a straw in half, first fold the straw and then cut it.
Prepare Skeletal Models. Use the chenille stems and straws to create skeletal models of the following shapes: cube, rectangular pyramid, triangular pyramid, and triangular prism.
Display 3-D Shapes Collection. In Lesson 6, students collected everyday objects that were examples of threedimensional shapes. Display these along with a set of Power Solids® for all students to see.
Prepare Table for Display. Prepare a table similar to the Edges, Vertices, and Faces Table page in the Student Activity Book on chart paper. See Figure 1. The remaining columns will be added in Lesson 8. Copy the 3-D Shape Sort Cards Master then cut apart and attach each shape to the display.
Assessment in this Lesson
| Assessment | Expectation Assessed |
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Observe |
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Triangular Prism |
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