The circumference of a circle is the distance around the shape. The ability to round a number to a number of decimal places or to a number of significant figures means that answers can be written to ...

Pi is a very long and a very important number, but how many decimal places of it do we really need to know? Dr Karl investigates. In the land of food, a pie is something from an oven that is usually ...

Today's Google doodle celebrates the 30th anniversary of Pi day. Pi day, observed on the 14th of March every year, celebrates the mathematical constant Pi. Pi represents the ratio of a circumference ...

There is Pi all around us, in ways you may not have seen before. If you remember from school, Pi is the ratio of a circle's circumference to its diameter. It is a number that is usually written as ...