A MATHS challenge had students going round in circles to find the perfect recipe for a slice of Pi.

Number-crunchers at Richmond School and Sixth Form College marked the mathematical day of March 14 with a visual interpretation of the world’s most recognised numerical constant.

Sticking brightly coloured numbers to lockers in the sixth form corridor, the students calculated the value of Pi to 42 decimal places.

Head of maths Scott Lunn said: “The date March 14 forms the first three digits of the ratio of a circle’s circumference to its diameter, 3.14.

“Our Year 7 students have just started to learn about circles so I thought this would be a great way to introduce them to the concept of Pi.

“It can be quite hard for some of them to get their head around Pi being an irrational number, which means it never ends and never repeats. In fact I think scientists have calculated Pi to more than a trillion digits."

The numbers were left up in school for the day for students to try to memorise the calculation to as many decimal places as possible.