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.

Why is the area of a circle proportional to the square of its radius? And why is that ratio the same as the ratio of the circumference to the diameter?

You draw a circle. From that circle, you can determine both the circumference and the radius. Then the value of pi would be the circumference divided by twice the radius. Simple, right?

This is not surprising, given the utility of calculating the circumference or area of a circle, which pi enables. Even ancient scholars developed geometric approaches to calculate this value.

What is pi and why is it important? Pi is the ratio of the circumference of a circle to its diameter, which is approximately 3.14.

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