Learn about the definition of pi in relation to a circle with this BBC Bitesize Maths article. For students between the ages of 11 and 14.

In 1880, the German mathematician Ferdinand von Lindermann proved that pi is a transcendental number and that squaring a circle is impossible under the constraints of Euclidean geometry.

Remember that the third side — which is equal to 3√2 — is the circle's diameter. We're trying to find circumference, which, as stated earlier, is equal to pi times diameter (c = πd).

Happy Pi Day! Here's how you can empirically determine the value of this well-known mathematical constant.

Pi represents the ratio of a circle's circumference (the distance around the circle) to its diameter (the distance across it). In mathematics, it's been represented by the Greek letter "π" since ...

Measure the diameter of the large circle using your ruler and record this number as the diameter of the large circle. Now, calculate the ratio of C/d (circumference divided by the diameter).