The angle of the depression from a water tower to a forest fire underneath the tower is 18 degrees. What is the angle of elevation from the forest fire to the water tower?

A. 68 B. 36 C. 72 D. 18

Question

The angle of the depression from a water tower to a forest fire underneath the tower is 18 degrees. What is the angle of elevation from the forest fire to the water tower?
 
A. 68  B. 36  C. 72  D. 18

anonymous · Answer

There should be degree symbols beside those number btw.

anonymous · Answer

|dw:1403056526770:dw|

anonymous · Answer

From that can you figure it out?

anonymous · Answer

|dw:1403056504033:dw|

anonymous · Answer

72 degrees?

anonymous · Answer

@halorazer

anonymous · Answer

Yep. What he put is pretty much the same thing except more geometry related.

anonymous · Answer

yea i see, thanks for the help @halorazer

anonymous · Answer

It's not 72 degrees.

anonymous · Answer

its not @walking_stick ?

anonymous · Answer

@halorazer

anonymous · Answer

Nope. Using geometry, can you solve for X?

anonymous · Answer

actually he's right. my bad.

anonymous · Answer

no i cant @walking_stick can you help me solve it?

anonymous · Answer

Alternate interior angles.

anonymous · Answer

Notice that if you make the 18 degrees extremely small, the angle X also becomes extremely small.

anonymous · Answer

i guess i see that @walking_stick

anonymous · Answer

What class is this for? Geometry?

anonymous · Answer

yes its for geometry

anonymous · Answer

@walking_stick

anonymous · Answer

As halorazor said, it is using the alternate interior angles theorem. http://mrpilarski.files.wordpress.com/2009/11/3-2-proving-lines-parallel-paragraph-proof-pilarski.jpg

anonymous · Answer

I apologize. That link is a poor example. Do some research in your text book about that theorem. It should be within the section you are currently studying.

anonymous · Answer

Here's a good link with a proof http://hotmath.com/hotmath_help/topics/alternate-interior-angles-theorem.html