## MaryJSmith Group Title What is the length of the portion BC of the cloth? 2 years ago 2 years ago

1. MaryJSmith Group Title

2. MaryJSmith Group Title

8cos35 degrees 8sin 35 degrees sin35 degrees/8 cos35 degrees/8

3. saifoo.khan Group Title

use sin ratio.

4. MaryJSmith Group Title

idk what that is..

5. saifoo.khan Group Title

$\sin \theta = \frac{opposite}{hypotenuse}$

6. MaryJSmith Group Title

idk what all that means..

7. saifoo.khan Group Title

|dw:1333128731997:dw|Dont sleep in class. ;)

8. MaryJSmith Group Title

I'm home schooled.. I can't sleep in class , haha . I just don't understand this stuff & I have HORRIBLE memory :) Ha !

9. saifoo.khan Group Title

lol. Ok. this is easy i can teach you. :)

10. MaryJSmith Group Title

So what is it exactly that I'm supposed to do here ??

11. saifoo.khan Group Title

There are three basic ratios. Sin ratio, cos ratio, tan ratio. you have to remember these.. Not them down somewhere.

12. MaryJSmith Group Title

okay..

13. saifoo.khan Group Title

|dw:1333128936512:dw|

14. saifoo.khan Group Title

|dw:1333129034555:dw|

15. saifoo.khan Group Title

Now these are the three sides. now it depends upon the question which two ratio you have to use.. you have to judge it by yourself.

16. saifoo.khan Group Title

Now in your question.. you are given hypotenuse and you have to find the opposite side.. so u will be using sin ratio.

17. MaryJSmith Group Title

i still don't get it though . like , what #'s do i plug in & where ?? it's so confusing to me!!

18. inkyvoyd Group Title

Ok, so the basic idea is that if you have a right angle, and You know the second angle, you know the ratio of the two sides. Now all of the trig functions essentially take in an angle, and out put a ratio.

19. MaryJSmith Group Title

i'm still confused :(

20. inkyvoyd Group Title

Do you want to talk it over in chat?

21. MaryJSmith Group Title

No.. too overwhelming . Just mssg me .

22. inkyvoyd Group Title

Can we do something like tiny chat? Messaging is too slow. If you have a skype, you could chat with me there (or create an anonymous one)

23. MaryJSmith Group Title

i cant , im also takin a test & i can only be on here & my test (im bein supervised)

24. inkyvoyd Group Title

Wait, you are allowed to go here and on your test?

25. MaryJSmith Group Title

Yes

26. inkyvoyd Group Title

Alright, Trigonometry is like an extension of triangle congruence.

27. inkyvoyd Group Title

*triangle similarity

28. inkyvoyd Group Title

For triangle similarity, we can prove that two triangles are similar given certain info (SAS, AA, SSS, etc). But if they are similar, then how can we figure out the side lengths they have?

29. MaryJSmith Group Title

idk..

30. inkyvoyd Group Title

The answer is that we use trigonometry. The basic idea of trig is that in a right triangle where we know all the degree measures, we can determine the ratio between the sides.

31. inkyvoyd Group Title

Tell me if you are following what I'm saying, ok

32. MaryJSmith Group Title

I'm not.. haha sorry . I am so confused !! I'm a visual/audio learner..

33. inkyvoyd Group Title

ok, who is supervising you? I have file that will help you a lot, but it's for a geometry software called "GeoGebra"

34. MaryJSmith Group Title

i have geogebra

35. inkyvoyd Group Title

Alright, take a look at this file. Tell me if it helps.

36. MaryJSmith Group Title

I'm just gonna guess cos theres like 4 or 5 probs like this & I have 15 mins to finish 20 more problems !!!!!

37. inkyvoyd Group Title

sigh. if they are typable, put them into wolfram alpha dot com or something,

38. Mikellaalbertson Group Title