## Lukecrayonz 4 years ago http://screensnapr.com/v/hK3zq2.png

1. Hero

|dw:1328468993493:dw|

2. Lukecrayonz

Hero, this is my teachers explanation "28] Here draw the plane to the top right and connect the lines as explained in the problem. You will see that the long side of your left triangle is equal to the hypotenuse of your triangle that is on the right. the altitude is the distance from the plane to the ground which is a side of your triangle on the right. First use Law of sines to find the long side of your triangle on the left and then use the fact that sine is opposite over hypotenuse to find your opposite side.". I am honestly, completely lost. Can you please help a little bit more?

3. anonymous

|dw:1328470459577:dw|

4. anonymous

there is my lousy picture

5. Lukecrayonz

Well those are largely different D:

6. anonymous

the triangle on the left has two angles you know 51 and 180-68 = 112 so you can find the third angle as 180 - 112 - 51 = 17 and one side that you know 2.5 so presumably we can solve the triangle using the laws of sines

7. Lukecrayonz

And the exact equation of that would be..

8. anonymous

|dw:1328470818902:dw|

9. Lukecrayonz

|dw:1328470842566:dw| See I had that and I confused myself more because obviously you cant have a zero angle.

10. anonymous

i suck a drawing these, but you should have $\frac{x}{\sin(51)}=\frac{2.5}{\sin(17)}$

11. anonymous

that picture is not right. you want a right triangle, not those

12. Lukecrayonz

Or is the angle 68 just me pulling something out of my retrice

13. anonymous

|dw:1328470950021:dw|

14. anonymous

i cannot draw here, but this is what i think you should be looking at.

15. Lukecrayonz

Well I'm nearly 100% sure I did that wrong because I got 6.6 :S

16. anonymous

so as i said, $\frac{x}{\sin(51)}=\frac{2.5}{\sin(17)}$ and therefore $x=\frac{2.5\sin(51)}{\sin(17)}$ $x=6.65$ rounded. now we need the altitude

17. anonymous

we now look at this triangle |dw:1328471113714:dw|

18. Lukecrayonz

I got 6.1

19. anonymous

and we see that $\frac{A}{6.65}=\sin(68)$ so $A=6.65\sin(68)=6.166$ rounded

20. anonymous

looks good, depending on how you round

21. Lukecrayonz

Thank you so much :D