Gateway arch - quadratic function

Task 1

Use the sliders to describe the Gateway arch as good as possible.

How does changing parameters a,b,c change the parable?

Task 2

Here is some information about this Memorial in Missouri: The Gateway Arch, known as the "Gateway to the West", is the tallest structure in Missouri. It was designed by Finnish-American architect Eero Saarinen and structural engineer Hannskarl Bandel in 1947 and built between 1963 and October 1965. It stands 630 feet (192 m) tall and 630 feet (192 m) wide at its base. [wikipedia] Use this Information to find a quadratic function that describes the shape of the memorial.
Gib die quadratische Funktion die du berechnet hast hier ein!