MAA Found Math for the Week of January 28, 2013
MAA FOUND MATH: The Freedom Bridge ("Vabaduse sild") in Tartu, Estonia was constructed in 2009. The roadway is suspended from an arch in the form of an inverted catenary (a catenary is the shape of the graph of a hyperbolic cosine, i.e., y = c cosh(x/c) for some constant c). The arch straddles the roadway at an angle so that the cars drive under the arch when crossing the Emajõgi river. Photo by Roger Nelsen (Lewis & Clark College).
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