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Sir Cumference and the Sword in the Cone
Author: Cindy Neuschwander
Illustrator: Wayne Geehan
Publisher: Charlesbridge Publishing
Copyright: 2003
ISBN: 1-57091-601-2
Number of Pages: 32
Ohio Standards Alignment: Grades 5–8

King Arthur has issued a challenge. The first knight to find the sword Edgecalibur will be the next king. Join Sir Cumference, Lady Di of Ameter, and their son, Radius, as they race to help their friend, Vertex, find the sword.  With their aid, he cuts out 2-dimensional shapes and folds them to make solid figures.  He then makes a data table to explore the relationship between faces, vertices, and edges of polyhedra. The last two conditions in King Arthur's clue help Vertex unravel the mystery of the location of the sword.

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How to Use This Book
Highlights and Insights
Related ORC Resources
Ohio Standards

 


How to Use This Book

  • Teachers could make their own "maps" (nets) on paper and have students construct the solid figures.
  • Students can develop nets of various solids and quiz each other on the figure represented.
  • Students should work with models of polyhedra to confirm Euler's formula (F + V = E + 2) for themselves. 
  • Teachers could make their own quest for students to find a prize in a figure described by geometric properties. Have students work in groups to go on the quest to find the prize.

Highlights and Insights

  • This book helps students understand what the map (net) of a figure is and how it is used.
  • The mappings found on page 5 show many of the basic figures that students should know. See if they can visualize and describe each figure before folding it.
  • The last page of the book goes into the history and mathematics detailed in the story.
  • The only difficulty with the story is how long the sword was. Many students would not know what the length of a sword should be.

    • Related ORC Resources

      Geometric Solids and Their Properties
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      Resource Information
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      Discipline: Mathematics
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      Professional Commentary: In this interactive geometry investigation, students explore geometric solids and their properties. There are five parts to the investigation that include the rotation of shapes on the computer screen as well as plans for straw construction of solids and patterns for nets....
      Cubes Everywhere
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      Building a Box
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      Ohio Standards

      Geometry and Spatial Sense Standard
        Benchmarks (5-7)
        I. Identify and draw three-dimensional objects from different views (top, side, front and perspective).
        Benchmarks (8-10)
        E. Draw and construct representations of two- and three-dimensional geometric objects using a variety of tools, such as straightedge, compass and technology.
        H. Establish the validity of conjectures about geometric objects, their properties and relationships by counter-example, inductive and deductive reasoning, and critiquing arguments made by others.
        Grade Level Indicators (5)
        8. Predict what three-dimensional object will result from folding a two-dimensional net, then confirm the prediction by folding the net.
        Grade Level Indicators (7)
        9. Draw representations of three-dimensional geometric objects from different views.
        Grade Level Indicators (8)
        1. Make and test conjectures about characteristics and properties (e.g., sides, angles, symmetry) of two-dimensional figures and three-dimensional objects.
        6. Draw nets for a variety of prisms, pyramids, cylinders and cones.
      Data Analysis and Probability Standard
        Benchmarks (5-7)
        B. Interpret data by looking for patterns and relationships, draw and justify conclusions, and answer related questions.
        Grade Level Indicators (6)
        6. Make logical inferences from statistical data.