### BARS::Parking Signs Behind Old Hardware Building in Tempe, Arizona

This parking sign was found in a parking lot behind the old hardware building located on Mill Avenue in downtown Tempe, Arizona.

The parking sign says...

```   +------------------------+
| Note your space number |
|    Pay at meter 48     |
--------------------------
|       Pay Parking      |
| 8 am - 4 pm            |
| except Sundays         |
| & Holidays             |
--------------------------
|        2  Hour         |
|        Parking         |
+------------------------+

the numbers are:  2  4  8  48

the math is:  48 / 8 - 4 = 2
```

This parking lot was also behind the Z Tejas Grill which is located at 20 W. 6th St. in Tempe. This parking sign picture includes the number `20` found on the back of Z Tejas.

```   the numbers are:  2  4  8  20  48

that math is:  sqrt(20 - 4) = 48 / 8 - 2

observe...
left-hand side
20 - 4 = 16
sqrt(16) = 4

right-hand side
48 / 8 = 6
6 - 2 = 4

pi off-by-one...

48 / 4 + 20 / 2    12 + 10     22      22
--------------- =  ------- =  ----    ---- approximates pi
8              8         8       7

more math from MAT102 students...

1) 48 = 4 x 20 / 2 + 8

2) 48 = 2(8 / sqrt(4) + 20)
```

In the 2nd BARS, the denominator in the fraction `22 / 8` is off-by-one with respect to the denominator in the fraction `22 / 7` that's used to approximate Pi. Calculate how much these two fractions really are off.

Creator: Gerald D. Thurman [gthurman@gmail.com]
Created: 16 September 2006

This work is licensed under a Creative Commons License.