1. ## Trigonometry HELP

I have this problem that I've already figured out, but I just need someone to check if it is right or not. I need to know if the picture I drew is correct as well.

Here's the problem and drawing:

The first thing I used was the Pythagorean Theorem to get length c and I got 161.6.

Then, I found the angle of elevation by finding the cosine the angle in red and got 51.8°.

Is this correct?

2. Originally Posted by meiyukichan
I have this problem that I've already figured out, but I just need someone to check if it is right or not. I need to know if the picture I drew is correct as well.

Here's the problem and drawing:

The first thing I used was the Pythagorean Theorem to get length c and I got 161.6.

Then, I found the angle of elevation by finding the cosine the angle in red and got 51.8°.

Is this correct?
you are correct. but that's overkill!

we didn't need Pythagoras' theorem. you could have just used the tangent trig ratio right off the bat. you know the height of the triangle (the opposite side to the angle of elevation) and the base of the triangle (the adjacent side to the angle of elevation). tangent = opposite/adjacent

3. Originally Posted by Jhevon
you are correct. but that's overkill!

we didn't need Pythagoras' theorem. you could have just used the tangent trig ratio right off the bat. you know the height of the triangle (the opposite side to the angle of elevation) and the base of the triangle (the adjacent side to the angle of elevation). tangent = opposite/adjacent
oh whoops. i wasn't really paying attention.
i guess i'll use the shorter way.
thanks

4. ## Angles of Elevation and Depression Problems

For a great visual explanation of similar examples, check out Mathematics.com.au - Angles Of Elevation && Depression

The lesson is fully narated as well so is very easy to understand.