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What do all of
the towers have in common?
What makes
them stable?
What do notice about the shape of the base?
Are there any geometric shapes that are
used often?

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Towers are wider at the base and narrower at the top.
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Towers are stable because of their wide base at the bottom.
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The shape of the base is triangular or rectangular.
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The triangle is a shape that is used often.
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