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B<br />
Bar Models<br />
Peter is building a bar model of a rectangular prism that is 5 cm long,<br />
3 cm wide, <strong>and</strong> 7 cm high.<br />
5. a. How many straws will Peter need to build the bar model of the<br />
rectangular prism?<br />
b. How many of each length does he need?<br />
Yol<strong>and</strong>a wants to make a pyramid with nine edges.<br />
6. Will she be able to make such a pyramid? Why or why not?<br />
7. How many straws do you need to make a bar model of pyramid<br />
with a triangular base? Make a drawing to verify your answer.<br />
Stable Structures<br />
Building Structures<br />
• Build a bar model of a pyramid with five vertices <strong>and</strong> eight<br />
edges.<br />
• Build another bar model of a shape with six vertices <strong>and</strong><br />
nine edges.<br />
8. a. Which of the structures you made is more stable? How does<br />
the number of triangular faces affect the stability of the<br />
structure?<br />
b. What could you do to make the other structure more stable?<br />
c. Is it possible to build a structure with nine vertices <strong>and</strong> five<br />
edges? Explain.<br />
16 <strong>Packages</strong> <strong>and</strong> <strong>Polygons</strong>
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