There are many approximation methods for area.
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About 153.86 square in. To find out the area of a circle do: r^2*pi.
17 ft x 11ft into square metres
The approximate surface area of a sphere with circumference 37.68km is 452km
The approximate area of a circle with a diameter of 60 centimeters is 2,827.43 square centimeters.
Calculus can be used to find the surface area of any object given that you know the equation describing said object. It's usually easier to find the area from experiment or through using a combination of existing models to approximate the surface area