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The letter pi is many thousands of years old, as is the idea of dividing the circumfrance of a circle by its diameter. But thetwo ideas, the letterand the number, came to mean the same thingonlyroughly 300 years ago.The first writer to use pi in the modern sense was William Jones in 1706, and the mathematician Euler helped make the use of the symbol popular. Euler also invented the use of e as the base of the natural logarithms and the use of i for the square root of minus one, and discovered the beautiful formula that e raisted to the power pi times i equals -1.

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Q: Who first discovered the symbol of pi?
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