## babydoll332 3 years ago Solve for x. Round your answer to 2 decimal places.

1. babydoll332

2. babydoll332

21.71 correct?

3. phi

how?

4. ganeshie8

looks u have used cos, u must use sin soh-cah

5. babydoll332

so, i tried again and got 14.90

6. phi

how? what steps are you taking?

7. babydoll332

sin opp/hyp

8. phi

that is a good start |dw:1350512679019:dw|

9. phi

can you fill in the numbers in sin( angle) = opp/hyp

10. babydoll332

the angles yess

11. babydoll332

then do that weird formula with A=(c+b)...

12. babydoll332

which now gave me 32.19

13. phi

what did you do?

14. babydoll332

sin(θ) = Opposite / Hypotenuse

15. phi

yes, but what numbers?

16. babydoll332

idk im lost idk my steps im getting it wrong its confusing me now

17. phi

Look at the picture. The angle is 34 degrees, right? I would replace θ with 34 in your equation sin(θ) = Opposite / Hypotenuse which side is opposite (look at my picture) how long is it?

18. babydoll332

90?

19. phi

90 is an angle (the right angle) the sides are the lines. I drew an arrow pointing at the line opposite the 34 degree angle

20. babydoll332

oh ok so 34/ hyp

21. babydoll332

couldnt i do pythergerium therom?

22. phi

34 is an angle. remember that you want the legs (the sides of the triangle)

23. phi

and we need to use trig here. pythagoras needs 2 sides (and no angles). But here we know 1 side and 1 angle. so we use trig. what is the length of the side opposite the 34 deg angle. look at the picture.

24. babydoll332

18

25. phi

yes. you replace opposite in sin(θ) = Opposite / Hypotenuse with 18. you replace θ with the angle 34 can you do that?

26. babydoll332

18/34

27. phi

pay attention: 34 is an angle. sin(θ) = Opposite / Hypotenuse means that the sin of an angle is opposite leg/ hypotenuse sin(34)= 18/x x because the picture calls the hypotenuse x now you need to solve for x can you do that ?

28. babydoll332

its 32.1 ! :DDDD

29. phi

just for info: If you are given 1+a and are told: replace a with 2, you would write 1+2 if your are given a/b and are told replace b with 3, you would write a/3 you need to do this "replace" to use these equations.

30. babydoll332

i got it its 32.1 !! :)

31. babydoll332

thank you so much for spending sooo much time on this with me !!!!

32. phi

how did you do it (it's right, BUT Round your answer to 2 decimal places.) but how did you do it?

33. babydoll332

32.19 i just re possisioned the sin(34)= 18/x

34. babydoll332

pluged it into the cal

35. babydoll332

to find x

36. phi

yes. You got it.

37. phi

if you have time, this video http://www.khanacademy.org/math/trigonometry/v/basic-trigonometry might be helpful. It helps me to see someone do the steps.