The ratio of a circle's circumference to its diameterpiis usually given in schoolbooks as "approximately" 3.1416 or 3.14159. As a decimal it can never be expressed exactly, but the decimal value has been carried out by patient mathematicians to 707 digits. At the Paris Fair last year this huge number was written, for the edification of fairgoers, round & round in a spiral on the inside wall of a circular room.
A worker on pi is Dr. Horace Scudder Uhler of Yale. He is not extending the decimal value of pi itself...
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