National Pi Day 2020 Deals: Discounts at Blaze Pizza, Papa Johns, Dairy Queen and More

Today, March 14 (3/14), is National Pi Day, a day that celebrates the mathematical symbol we all came to know and love in school.

Also known as π, the Pi is the ratio of a circle's circumference to its diameter—the distance around the edge is a little more than three times the distance across. As it appears on a calculator, Pi is 3.141592654, however, this is not its exact value. Pi is a constant number, which means it has no end. It is also known as an irrational number as it has no repeating pattern.

The History of Pi

Mathematicians and scientists have been trying to uncover the mystery of Pi for thousands of years, dating back to Ancient Greece and Babylonian times.

According to Britannica Encyclopedia, in 2,000 BCE Pi used to be known as 3.125. This was because the Babylonians calculated the perimeter of a hexagon within a circle. Moving onto the ancient Egyptians (1650 BCE), the mathematical ratio became 3.16045, as shown in the Rhind papyrus—a document that included mathematical tables and problems.

Archimedes, the Greek mathematician, devised a method—in 250 BCE—to obtain Pi to any desired accuracy. According to Britannica, the mathematician "inscribed and circumscribed regular polygons" about a circle to get the upper and lower bounds, getting an average value of 3.1418. Archimedes also discovered that the ratio of the area of a circle to the square of its radius is the same constant.

The symbol for Pi was devised by a British mathematician named William Jones in 1706 AD and was later popularized by the Swiss mathematician Leonhard Euler. Today, it is used in various formulas of physics and engineering to describe the motion of pendulums, the vibration of strings, and alternating electric currents.

As the first three numbers in Pi are 3.14, March 14 is known as National Pi Day.

National Pi Day Deals 2020

To make the most of National Pi Day, Newsweek rounded up deals all over the U.S. to help everyone appreciate the mathematical constant that is used to much in our society today. To bring some of these bargains to readers, we've worked with couponing site CouponFollow.com.

The Daytona Hotel: Blue Flame located inside the hotel is offering guests a free Moonshine cocktail on National Pi Day when they purchase one of their track pies — pizzas with a unique oval shape that mimics the design of the famous Daytona International Speedway racetrack

Harry & David: Save 20 percent on pies from the online gift site using CouponFollow's exclusive code HDCF20

Blaze Pizza: Use the Blaze Pizza app to get pizza for $3.14. Offer available on March 14 after 3:14 p.m. local time

Papa Johns: Buy one large pizza at regular price and get one for just $3.14, says CouponFollow.com

Cici's Pizza: Buy one adult buffet and drink at regular price and get one for $3.14 — perfect for a get together with a circle of friends

Pieology: Purchase one artisan thin pizza and get one for just $3.14, says CouponFollow.com. The pie place is also doing a contest for app rewards members to win free pizza for a year

Coco's: Celebrate on March 14 with one free slice of pie between 4 -10 p.m. if you're an e-club member

7-Eleven: From midnight on March 14, through to 11:59 p.m., customers can get a whole pizza for $3.14 through the company's 7Rewards app, as well as 50-cent slices

Papa Murphy's: Get 31.4 percent off orders $20 of more on March 14, using the code PIDAY

Boston Market: Buy one get one free chicken pot pies (with 3.14 etched into them) with use of the Boston Market coupon on their site on March 14

Marie Callender's: Get one free slice of pie with use of its coupon on March 14

Lou Malnati's: Dine in and get a Chocolate Chip Cookie Pizza for $3.14 on National Pi Day

1000 Degrees: This offer is through the 1000 Degrees Rewards App — get a classic or build your own 10 inch pizza for $3.14

Your Pie: Get pizza pies for $3.14 all day on March 14 — customers must have the Your Pie app to get the offer

Fired Pies: From 11 a.m. through to 4 p.m. on March 14, get any 1-topping pizza at Fired Pie for $3.14 with the purchase of any drink

Pilot Flying J: Until March 15, get $5 off any whole pizza through the Pilot Flying J app

Dairy Queen: By one get one for 80 cents on pie-flavored blizzards for a limited time

Cheesecake Factory: If you don't fancy pie or pizza, get a free slice of cheesecake with any DoorDash delivery order of $15 or more weekdays only until 5 p.m. Use the code LUNCHSLICE

Schwan's: Via Instacart, customers that spend $25 on Edwards Frozen Pies can save $5 or unlock free delivery — offer valid until March 29

SusieCakes: For one day only, the bakery will be serving up their signature lineup of 9-inch decadent pies, each with a fittingly $3.14 discount along with limited edition pi themed cupcakes — the $3.14 discount on the 9-inch pies are limited up to five pies per person and this offer is only valid for same-day orders, phone or walk-in guests only

Hungry Howie's: Buy one medium one-topping pizza for $3.14 with any bread purchase at menu price — available at participating locations nationwide from March 13 - 15

BJ's Restaurant & Brewhouse: Guests can buy a mini one-topping Pizza featuring the perfect cheese-to-crust ratio for $3.14 — the offer is on National Pi Day only and for dine-in customers

Fresh Brothers: The premium pizza brand is offering $3.14 personal pizzas in cheese, pepperoni or plant-based Daiya Vegan Pepperoni — available on all dine-in, delivery and carryout orders all day on March 14

Fireman Derek's Bake Shop: On "Pi Day" customers can get a limited selection of pie slices for just $3.14—eligible flavors include Key Lime Pie, Salted Caramel "Krack" Pie, Salty Monkey Pie, Pecan Pie, Apple Pie, Guavaberry Pie and Chocolate Pecan Pie

Outer Aisle: Until March 21, get 20 percent off an order on www.outeraislegourmet.com using the code PIDAY at checkout

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