## Missaa143 2 years ago Needing help(: PLEASE!

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1. luckythebest

so whats the question sir

2. Missaa143

3. Missaa143

4. Missaa143

answers to the bottom –70.3 12.4 11.1 6.5

5. Missaa143

answers to the top 3.7 11.5 3.3 4.5

6. luckythebest

Ok. so which trigonometric ratio would mean the ratio of $\frac{ 9 }{ x }$

7. SerikMB

use sine theorem

8. SerikMB

note sin(90)=1

9. Missaa143

wait what lol sorry guys im not that great at this :(

10. luckythebest

@Missaa143 at least you are aware that there is something called sin x, cos x etc etc etc ?

11. Missaa143

yes

12. SerikMB

ok, let's consider the first one

13. SerikMB

use pythogorean theorem to find hypothenuse (the longest side of right triangle)

14. Missaa143

okay right

15. SerikMB

hypothenuse^2=5^2+x^2

16. SerikMB

hypothenuse/sin(90)=x/sin(42)

17. luckythebest

@Missaa143 so you know which side divided by which side is cos of any angle?

18. Missaa143

okay gotcha!

19. SerikMB

or you can go directly, x/sin(42)=5/sin(90-42)

20. Missaa143

7/30

21. Missaa143

= 0

22. luckythebest

u can also use Tan of 42 = x / 5.

23. Missaa143

true! ^

24. Missaa143

ill say the first one is 3.3 ?

25. SerikMB

$\frac{ x }{ \sin(42) }=\frac{ 5 }{ \sin48 }$

26. SerikMB

no it will be 4.5

27. Missaa143

Ooooo okay i get it!

28. luckythebest

in 2nd one you have hypotenuse = x, and base = 9. So which trig. ratio means base/hypotenuse?

29. Missaa143

i think its D ?

30. msoemosharro

I think it would be easier if you use tan(42)=x/5 => x=5tan(42)