for where pi = 3.14159265500:
500 * pi = 1,570.79633
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The external surface area of a pipe is a rectangle with dimensions of the circumference of the pipe multiplied by the length. 48*pi*500 24000*pi square feet about 7550208 square feet
110
500 feet
Historically one of the early methods of estimating the value of π was by taking a circle and inscribing and circumscribing a regular polygon (constructing a regular polygon inside and outside the circle- they knew how to do that mathematically 500 BC in Greece for a great number of polygons) They took the average of the circumferences of the polygons and divided that by the average of the diameters of the polygons to approximate a value for π.
If you mean a cylinder then it is: pi*13002*500 square mm