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Stable Cubes<br />
• Use the bar model of the cube you made in the activity on<br />
page 14.<br />
• Add the minimum number of face diagonals to make the cube<br />
stable.<br />
Another type of diagonal to consider is called the space diagonal.<br />
The space diagonal goes through the inside or space of the cube,<br />
connecting two vertices.<br />
It does not lie on any of the faces. In this drawing, the extra bar connects<br />
a vertex the upper back down to the vertex on the front bottom.<br />
12. How many space diagonals does a cube have? Show them all on<br />
Student Activity Sheet 4.<br />
13. Which of the shapes on page 2 do not have face diagonals?<br />
Which of the shapes on page 2 do not have space diagonals?<br />
14. Name each shape <strong>and</strong> find the number of face diagonals <strong>and</strong> the<br />
number of space diagonals.<br />
a b c<br />
18 <strong>Packages</strong> <strong>and</strong> <strong>Polygons</strong>
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