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	Comments on: Variations on the Number 3	</title>
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		<title>
		By: Bon		</title>
		<link>https://mathfour.com/arithmetic/variations-on-the-number-3#comment-7412</link>

		<dc:creator><![CDATA[Bon]]></dc:creator>
		<pubDate>Tue, 02 Apr 2013 13:00:29 +0000</pubDate>
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					<description><![CDATA[In reply to &lt;a href=&quot;https://mathfour.com/arithmetic/variations-on-the-number-3#comment-6522&quot;&gt;Allen Arnold&lt;/a&gt;.

Very cool, Allen! Reading that gave me goosebumps (circular, but they don&#039;t need to be rigid!)]]></description>
			<content:encoded><![CDATA[<p>In reply to <a href="https://mathfour.com/arithmetic/variations-on-the-number-3#comment-6522">Allen Arnold</a>.</p>
<p>Very cool, Allen! Reading that gave me goosebumps (circular, but they don&#8217;t need to be rigid!)</p>
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		<title>
		By: Allen Arnold		</title>
		<link>https://mathfour.com/arithmetic/variations-on-the-number-3#comment-6522</link>

		<dc:creator><![CDATA[Allen Arnold]]></dc:creator>
		<pubDate>Tue, 26 Feb 2013 06:16:55 +0000</pubDate>
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					<description><![CDATA[A 3-sided polygon, a triangle, is the only &quot;rigid&quot; shape. Any polygon with more than 3 sides is not rigid because it can be easily deformed. A triangle, by contrast, is strong because it resists deformation. Therefore, triangles are often used in construction. For example, &quot;trusses&quot; are structures made of steel beams in the form of triangles. Often, many smaller triangles are welded together to form larger triangles for greater strength. Trusses are used wherever strength is needed: bridges and supports of all kinds. The Eiffel Tower is made of trusses consisting of thousands of steel triangle-shaped constructions.]]></description>
			<content:encoded><![CDATA[<p>A 3-sided polygon, a triangle, is the only &#8220;rigid&#8221; shape. Any polygon with more than 3 sides is not rigid because it can be easily deformed. A triangle, by contrast, is strong because it resists deformation. Therefore, triangles are often used in construction. For example, &#8220;trusses&#8221; are structures made of steel beams in the form of triangles. Often, many smaller triangles are welded together to form larger triangles for greater strength. Trusses are used wherever strength is needed: bridges and supports of all kinds. The Eiffel Tower is made of trusses consisting of thousands of steel triangle-shaped constructions.</p>
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