Celebrate 'Pi Day' With Deals

PHILADELPHIA (CBS) - Monday is a delicious day for deals, check the date! March 14 or 3.14 is "Pi Day."

To celebrate, 7-Eleven is offering pizza for $3.14 for rewards members.

Amazon Prime members can get $3.14 off any large cherry and apple pies at whole foods, while supplies last.

What exactly is pi?

It is the ratio of a circle's circumference to its diameter and the trillion digit ratio is rounded to 3.14.

Now, you know what you're celebrating while you eat!