Happy PiDay! Read more about the significance of the number 3.14 and how it originated by clicking the link below.
to find the areas of the two polygons. This gave him the upper and lower limit for the area of the circle. He started with a hexagon, then repeatedly increased the number of sides of the polygons. With each iteration, the polygons got a little bit closer to the size of the circle they sandwiched, a technique called the method of exhaustion, or as mathematician Steven Strogatz puts it, a “squeeze technique.
Over the centuries Chinese, Indian and Arab mathematicians continued to calculate pi to more and more decimal places. In 1706, Welsh mathematician William Jones came up with the idea of using the Greek letter π, or pi, to represent this special constant. Isaac Newton worked out how to calculate pi to 16 digits. In the early part of the 20th century, Indian mathematician Srinivasa Ramanujan came up with even more efficient ways to calculate pi.
Pi is useful for more than finding the area and circumference of a circle. It turns up in all kinds of places, pretty much in any calculation that involves curves. Pi is used in fields from construction to quantum physics, from music theory to medicine. Humans would never have made it to the Moon without pi. These days we probably wouldn’t make it across town; pi is essential to GPS systems, because, of course, Earth is round.
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