• Dec 14th 2008, 05:17 PM
4AM
1. Elspeth looks out her window at a building across the street. She measures the angle of depression of the base of the building to be 32.7 degrees, and the angle of elevation at the top of the building to be 41.9 degrees. Elspeth knows the window is 13.9 m from the ground. How tall is the building across the street?

http://img67.imageshack.us/img67/7301/trianglewz5.jpg
It'd be great if someone could just tell me what I need to solve? This question kind of confuses me. And which side is it that I'm solving for?

2. <A is an obtuse angle, and sin A = 0.841. Find <A.

How would I solve this question, because when I move sin to the other side of 0.841, I get 57.24. And an obtuse angle is more than 90 degrees if I'm not mistaken. Am I doing something wrong?
• Dec 14th 2008, 05:53 PM
Quote:

1. Elspeth looks out her window at a building across the street. She measures the angle of depression of the base of the building to be 32.7 degrees, and the angle of elevation at the top of the building to be 41.9 degrees. Elspeth knows the window is 13.9 m from the ground. How tall is the building across the street?
x is the distance you want.
Attachment 9260

Quote:

2. <A is an obtuse angle, and sin A = 0.841. Find <A.
Use a unit circle. If the marked angles are equal, then the verticle lines have the same length.
Attachment 9261
• Dec 14th 2008, 05:56 PM
4AM
Alright, thanks for the help!