Euclid proved that this ratio (C/d) is always the same, no matter the size of the circle.
Hey, it's Pi Day! So celebrate one of the mathematical mysteries with friends/family/loved ones/your Math teacher.
For several thousand years, much effort has been put into understanding and calculating π.
So far we know 1.7 trillion digits.
Pi Day is a special day in the lives of many a nerd.
Pi, Greek letter (π), is the symbol for the ratio of the circumference of a circle to its diameter.
The first Pi Day celebration was held at the San Francisco Exploratorium in 1988,
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