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Tower City Parabolas with Sliders

This is a photo of the fountains at Tower City, Cleveland, Ohio, USA. Match the fountain streams as closely as you can, using vertex form of a parabola. Get an approximate value using your mouse for the sliders; get precise using the left and right arrow keys on your keyboard. The photo was taken by Cate Terez and Preeya Shankar, Hathaway Brown class of 2013.