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Unformatted text preview: Click on the player above to hear the audio lesson. To download the lesson, right-click (PC) or control-click (Mac) here , and save the file to your desktop. Overview: Supporting Details Welcome to St. Louis, Gateway to the West. To commemorate St. Louis's key role as a starting point for western expansion, there's the 630-foot Gateway Arch. You'll get an up-close glimpse of its enormous dimensions as you stroll through the Jefferson National Expansion Memorial Park. The design and erection of this structure were a monumental engineering feat. The mathematical formula used to calculate the balance needed for the arch employed massive equilateral triangles on each of the legs. In order to construct this arch, supports were needed. Without supports of steel and concrete, the structure would fall. So it is in our reading. An author uses supporting details to back up main ideas or to So it is in our reading....
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- Spring '10
- busy season