Pi Day 2025: Pizza Chains Offer $3.14 Deals Nationwide

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Pi Day on March 14 celebrates the mathematical constant 3.14, with restaurants nationwide offering discounts and freebies on pies and pizzas.

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Papa John's rewards members can buy one large pizza and get a second for just $3.14, while California Pizza Kitchen offers select pizzas at the same price with a $25 purchase.

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Marco's Pizza customers can score a medium one-topping pizza for $3.14 with a larger pizza purchase using code "PIDAY," and Cicis has a similar BOGO deal.

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Beyond pizza chains, dessert spots like Perkins and Village Inn offer free pie slices with entrée purchases, while 7-Eleven sells whole pizzas for $3.14.

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The mathematical constant pi, representing the ratio of a circle's circumference to its diameter, has practical applications in fields like engineering, physics, and astronomy.

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Pi Day originated in 1988 at San Francisco's Exploratorium and gained official recognition when Congress designated March 14 as the holiday in 2009.

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NASA scientists use pi daily for calculating orbits, spacecraft communication, and even parachute deployments for Earth or Mars landings.

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Using just nine digits of pi allows scientists to calculate Earth's circumference with remarkable precision, erring by only about a quarter inch per 25,000 miles.

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