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"...although many mathematicians have tried to find it, no repeating pattern for pi has been discovered..." (http://mathforum.org/dr.math/faq/faq.pi.html).
you find the surface area of a circle by first finding the area of the circles/ two ends. you do this by multiplying the diameter by pi then multiply by two, that is both ends put together then you find the area of the flat part by finding out the circumference of the circle ends, then multiply that by the height of the cylinder. circumference= pi times the diameter then add all your calculation together, and you have the surface area of your cylinder :)
This is an easy calculation to do. Simply multiply the diameter by Pi (about 3.1416).15mm x 3.1416 = 47.124 mm circumference.
Every person who has ever used the "value" of pi in a calculation has used an approximation.
Archimedes