## highschoolmom2010 2 years ago Find the value of each variable. If your answer is not an integer, express it in simplest radical form

1. highschoolmom2010

@jdoe0001

2. jdoe0001

hehe, same thing you see the 30, 60 and 90 angles?

3. highschoolmom2010

yes

4. highschoolmom2010

|dw:1375657637657:dw|

5. jdoe0001

so their relationship are |dw:1375657891270:dw|

6. highschoolmom2010

that is where i started getting confused....

7. jdoe0001

ok, which part throws you off?

8. highschoolmom2010

|dw:1375657762568:dw|

9. highschoolmom2010

^^that

10. jdoe0001

what that means is just that the longest side is TWICE as much as the smallest side so "2a" is twice as much as "a" so if I had a 30-60-90 triangle whose smallest side were say 25 then the longest will be TWICE as much, or 50, thus |dw:1375658213907:dw|

11. jdoe0001

if I had a 30-60-90 triangle whose smallest side were say "WHATEVER" my longest side will be "WHATEVER" x 2

12. jdoe0001

still confused?

13. highschoolmom2010

not on the 2a part but what about the a sqrt3

14. ienarancillo

you just have to multipy the 20 with the sqrt of 3.

15. ienarancillo

first, you have to divide 40 by 2, in order to find a. cos its 2a/2 > you will now find a. and then there it says "a sqrt of 3", so you just have to multiply a with sqrt of 3.

16. ienarancillo

do u get it? :)

17. phi

btw, this video goes over 45-45-90 and 30-60-90 triangles. These videos are helpful

18. highschoolmom2010

i have never used any terms relating to trig so no i dont really get it :( @phi what video??

19. phi
20. highschoolmom2010

oh ok ill watch it

22. highschoolmom2010

nope not even close

ok...you want to find x and y..right?

25. highschoolmom2010

yea.. i tried to do it and was told it was wrong so i got confused nope im in geometry

26. highschoolmom2010

@phi it kinda helped me figure that sqrt 3 part bu tnot how to do the problem

|dw:1375807850273:dw|

28. phi

in that case watch the video where he does examples

or we can go using geometry

30. highschoolmom2010

that would help better

ok

this is a 30-60-90 triangle

|dw:1375808252038:dw|

this means BC is AB*root 3

and AC is AB*2

okay?

37. highschoolmom2010

ok

so BC=root3 *(x) =y

and AC=x(*2)=40

40. highschoolmom2010

can u draw what u are saying im *more visual*

|dw:1375808671220:dw|

from this x=20 and put that x to find y

43. highschoolmom2010

|dw:1375808797534:dw|

yes

45. highschoolmom2010

like that ????

yes...you got it

47. highschoolmom2010

so so what now....

x=20 and y=20 root3

49. highschoolmom2010

HOLY COW I DID IT :DDDDD

hmm...Congrats....:D

51. highschoolmom2010