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## charlotteakina 3 years ago do I use sin, tan, cos for this?

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1. Valkarie70

cos

2. Valkarie70

because the opposite is not defined you cant use sine, but you have adjacent and the hypotnuse which means you can use cosine

3. Valkarie70

yep

4. nubeer

nop its base/hyp

5. Valkarie70

but you dont have the base therefore you must use cosine

6. nubeer

so it should be 2.28/4.07

7. nubeer

well i think thats the way it should be done.. maybe you can ask someone else to confirm it.

8. nubeer

well no cos function will be use.. adjacent = 2.28 , hyp =4.07

9. nubeer

yes.

10. Valkarie70

yes, so you cant do sine because it requires you use adjacent

11. nubeer

lol no.. its cosine.

12. nubeer

Some People Have Curly Brown Hair Through Proper Brushing. now just look first letter of each word. S=sin, P= perpendicular, H= Hyp, C=Cos , B= bAse, T=tan

13. nubeer

|dw:1352832846895:dw|

14. nubeer

that is a formula for making things easy.. mean when u use sin=perp/hyp cos= base /hyp , tan =perp/base

15. nubeer

base and hypotaneous will be the sides with angle.. and perpendicular is the side opposite of the angle on which we are working.

16. nubeer

|dw:1352832995681:dw| if we are working on this mark angle then your Hyp base and perp will be this.

17. nubeer

|dw:1352833051199:dw| if you are working on this angle then your hyp base and perp are this.

18. nubeer

hahah lol i am not crazy :P and yes thats an easy way to remember sides we have to take with cos sin and tan..

19. JakeV8

Not yet... 0.560 that is the cosine of Angle A. Now you need to use "Inverse Cosine" to get angle A.

20. JakeV8

do you have calculator? I am using the windows calculator... it has a button called "Inv" (for inverse), so I hit that button, then the "cosine" button. Actually, when I hit "Inv", then my cosine button turns to cos^-1 like: $\cos ^{-1}$

21. snowandsuch

cosine = a/c

22. JakeV8

Yes, that's exactly right :) Nice work.

23. JakeV8

If you have an angle, you can use the sine, cosine, and tangent ratios to solve for a missing side. If you don't have an angle shown, but you do have side lengths shown, you can use the same ratios, but then with inverse cosine, inverse sine, or inverse tangent to solve for the missing angle.

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