This Monday, March 14, is National Pi Day. No, not pie — though we love pie. We're talking about pi, as in the number. If it's been a while since you've taken a math class, pi or 3.14 is an infinite number that's equal to the ratio of the circumference of a circle. But we prefer to think of it in simpler terms: Pi Day is the day when many restaurants and bakeries in town offer discounts on pies or other baked goods.

From a slice of pecan pie to a chocolate whoopie pie, check out these deals and steals you can snag on one of the nerdiest (and sweetest) holidays of all. 

Discounted Mini Key Lime Pies at The Bakery PHX 

The Bakery PHX (one of our top bakeries in town) is celebrating Pi Day with 10 percent off its signature mini key lime pies. It's a straightforward deal that's much easier to understand than pi-related geometry. For details, check The Bakery PHX's website. 

Bubby Goober's Baked Goods at Peixoto Coffee

On Monday, the glass case at downtown Chandler's Peixoto Coffee will be filled with Bubby Goober's Baked Goods. This local company slings handheld pies and vegan galettes made with organic, local, and non-GMO ingredients. You can nab flavors including black and blueberry, cherry amaretto, rosemary apple, and pear bourbon with a chai-spiced crumble. You might want to get here early as these pastries are only available while supplies last. For more information, visit the Bubby Goober's Baked Goods Facebook page. 

Hand Pies at Keep It Cut

No, you did not misread the above heading. If you get a haircut at any of Keep It Cut's three metro Phoenix locations, you can also get a complimentary hand pie from Chandler-based bakery AZ Food Crafters. Keep It Cut, if you aren't aware, is the local salon that offers memberships for those who want frequent cuts without having to pay every time. For more information, visit Keep It Cut's website. 

Fruit Tarts and Lemon Meringue Pies at Delice Bistro 

Tempe's Delice Bistro will be selling fruit tarts and lemon meringue pies for (you guessed it) $3.14 on National Pi Day. For more information, check the Delice Bistro website. 

Whoopie Pies at Hogs N' Hops 

On Monday, March 14, Scottsdale's Hogs N' Hops will sell its chocolate whoopie pies for the date-appropriate amount of $3.14. The BBQ, beer, and bourbon joint's treat combines two pieces of chocolate cake and a sweet marshmallow filling. For more information, visit the Hogs 'N Hops website. 

Pecan Pie at Texaz Grill

If you love traditional pies and want to celebrate the spirit of Texas with a dessert (pecan is the state tree of The Lone Star State, after all), Texaz Grill can help. On Monday, the Phoenix restaurant will be selling slices of its pecan pie for the magical number of $3.14. You don't need to be a math expert to know that you're getting a deal here. For more information, check the Texaz Grill website.