These park signs were found on Pi Day 2009 in downtown Tucson, Arizona.

The park signs say...

+---------------------+ | Keep Dogs Leashed | | (T.C.C. 4-97) | | Pick Up Dog Litter | | (T.C.C. 4-102) | | Skateboarding | | Prohibited | | Tucson Code Section | | 21-3-7 | +---------------------+the numbers are: 4 97 4 102 21 3 7 the math is: (21 / 7) * 4 + sqrt(4) = sqrt(102 + 97 - 3) rsPiEval: ((102 - 97 - 4) * (4 - 3) + 21) / 7 = Pi * 22/7 approximates Pi (3.14) rounded to nearest hundredth rsPhiEval: (4 / 4 + sqrt(102 - 97)) / ((21 / 7)! / 3) = Phi * Phi is the golden ratio and it approximates 1.61803399 more math: (21 - ((102 - 97) * 4)) * 4 + 3 = 7 more math: 21 - 102 + 97 - 4 - sqrt(4) - 3 = 7 There are great numbers in this BARS and many more equations to be found, but MathBabbler will find them later. In other words, this BARS is to be continued!

**Creator:** Gerald Thurman
[gthurman@gmail.com]

**Created:** 13 April 2009

This work is licensed under a Creative Commons Attribution 3.0 United States License.