Ooops, I made a mistake. That's what happens when you don't sleep for two days. Pi is the ratio of the circumference to the diameter of a circle. In my Pi calculator I made it the radius, not the diameter. My original idea was that it would be more accurate to measure the radius than to measure the diameter and make sure it passes through the centre, but I forgot to add in the multiplication to get the figure back to diameter. Good thing I didn't release the calculator yet. OK, tutorial will continue in a few minutes, just need to get some drugs (caffeine and nicotine). As to the question of "What is Pi?". Pi is a number that has still not ever been calculated properly. The closest mathematicians have come, is a number 400 000 000 000 digits long. The number was first used by the Babylonians (2000BC), who calculated it at 3.125, and for modern use the number 3.14159 is considered acceptable for everyday use (Everyday use? Yeah, like we do use it everyday, lol!!).

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