## anonymous 4 years ago A building casts a shadow 168 meters long. At the same time, a pole 5 meters high casts a shadow 20 meters long. What is the height of the building?

1. Mathhelp346

42

2. anonymous

how did you get 42?

3. Mathhelp346

|dw:1328681879036:dw|

4. anonymous

|dw:1328684511946:dw| $\theta = \tan^{-1}\frac{5}{20}=14.036 degree$ x {height of building }=$$\tan \theta \times 168 = 42 meter$$ which is the same of first and second answer but with explaining

5. anonymous

i have another process, and it's using ratio and proportion. |dw:1328693204503:dw|