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The Sydney Harbour bridge is a magnificent structure of mathematical genius, located in what has to be the world’s most beautiful city.

In this lesson we look at the mathematics associated with the Sydney Bridge, including deriving the Quadratic Equations for both the lower and upper parabolic arches of the bridge. We then look at some additional mathematics of the bridge, as well as some similar bridges in other countries.

There is an accompanying worksheet of our labelled measurement photographs, for teachers to set their own mathematics classes the task of calculating these equations. (See the “Free Gift to Subscribers” section at the end of this lesson for details).


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