### BARS::Bridge Sign in Arizona Evaluates to 'pi'

This bridge sign is located along old US Hwy-80 that connects Tonopah with Gila Bend. { the bridge} {the bridge}

The sign says...

```   +---------------------------+
|      B R I D G E          |
| height clearance 13' 6''  |
|    width clearance 18'    |
| maximum weight 40,000 lbs |
+---------------------------+
```
```   the numbers are: 13  6  18  40,000

the math is: sqrt(sqrt(40000)) - (18 - 13 + 6) = Pi (3.14)

observe...
sqrt(40,000) = 200
sqrt(200)     = 14.1421356
- (18 - 13 + 6) = 11.0000000
-----------------------------
3.1421356
Pi =  3.14159265

[solve for 'n']  sqrt(sqrt(40000)) - (18 - n + 6) = Pi (3.14)
```
##### About BARs Analysis

The square root function is handy for reducing large numbers into smaller numbers. MathBabbler adopted RoadSignMath.com's policy of allowing square root without requiring a two.

The square root of `40,000` was clear, but we were unable to work with the resulting `200`. Out of curiosity we did a square root of `200` and noticed the `.14` in the result. We observed that if `11` could be subtracted from `14`, we'd have an approximation of Pi. It didn't take long to get the remaining three numbers to evaluate to `11`.

##### Exercises
```   2000 lbs per ton
12 inches per inch
3 feet per yard
```
1. The height clearance is `_______ inches`.

2. The width clearance `_______ yards`.

3. The maximum weight is `_______ tons`.

##### Update::2010.03.25

This BARS was selected to be a BARS of the Week for week #10 of the Spring 2010 semester.

```   the numbers are: 13  6  18  40,000

the math is:  40000 % 13 + 6 = 18

BARSfunc rsStateEval:  spf(40000) + 13 + 18 / 6 = 48
* Arizona was the 48th state admitted to the Union.
* spf(n) = the sum of the prime factors of n
* spf(40000) = 2+2+2+2+2+2+5+5+5+5 = 32

BARSfunc off-by-one rsAgeEval:  spf(sqrt(40000)) + 13 + 6 + 18 = 52+1
* MathBabbler was 52 years young when he found this equation.
* sqrt(40000) = 100; spf(200) = 2+2+2+5+5 = 16
```

Creator: Gerald D. Thurman [gthurman@gmail.com]
Created: 13 March 2006 