- anonymous

@SmoothMath I need your help D:
Use △DEF, shown below, to answer the question that follows.
http://learn.flvs.net/webdav/assessment_images/educator_geometry_v14/pool_Geom_3641_0402_02/0402_G2_Q3.gif
What is the value of x rounded to the nearest hundredth?

- chestercat

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- anonymous

What have you tried so far?

- mathslover

|dw:1341504473383:dw|

- anonymous

This is very similar to the kind of problem I taught you before.

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## More answers

- anonymous

Well I looked at the triangle and saw that like EF is opposite and DE is adjacent sooo I use tan?

- anonymous

Very good. Keep going. Use tangent to set up the equation.

- mathslover

soa cah toa .. tan (theta)= opposite / adjacent .. good u r going right best of luck

- anonymous

soh cah toa*

- anonymous

SmoothMath help me

- anonymous

Sorry, Becca is cuter.

- anonymous

:3> xD thanks
Okay, um Tan(45) = x/55 ?

- anonymous

x= 2,475

- anonymous

Looks good. Solve for x and then round to the nearest hundredth like they ask.

- anonymous

Oh wait. One problem with your equation. The angle isn't 45.

- anonymous

lol derp. 49
Tan(49) = x/55
x= 2,695

- anonymous

or just 2700

- anonymous

I don't know what you did, but 2,695 is super super off.

- anonymous

D: I thought it was 49 x 55 to find out x to then divide it and then make it like...right
=2695/55 = 49

- anonymous

TANGENT of 49... super different from 49.
Use your calculator to find out what tan(49) is. Make sure you're in degrees and not radians.

- anonymous

tan(49) = x/55
Just solve for x, then let your calculator do the trig function for you.

- anonymous

my calculator doesn't do anything but x/55

- anonymous

It really doesn't have sin cos tan buttons on it? You'll need to use a different calculator then, or else use google or alpha.

- anonymous

This is what I use http://web2.0calc.com/

- anonymous

Or is it just the 1.15 thing

- anonymous

ohhh like tan(49) = 1.15/55 ?

- anonymous

Far left, below pi, you'll see the buttons sin, cos, and tan. Those are your trig functions. To do this one, click tan, then 49, then ). Should look like this:
I've boxed the trig function buttons in blue and the way to switch between degrees and radian modes in green.

##### 1 Attachment

- anonymous

Becca, please don't forget how to do simple algebra.
tan(49) = x/55
How do you solve for x?

- anonymous

49/1 • x/55? ... My brain...it's dying. :(

- anonymous

multiply both sides by 55. -_-

- anonymous

-__- dollface
49 • 55 and x/55 • 55?

- anonymous

not 49*55.
tan(49)*55

- anonymous

and what is x/55 * 55?

- anonymous

1?

- anonymous

oh my goodness.
Becca, can you solve this equation for me?
4 = x/2

- anonymous

8

- anonymous

Same dang thing here.
tan(49) = x/55

- Wolfboy

55*49.........

- anonymous

Wrong, wolfboy.

- anonymous

Its not just 55*49 D: he said it's tan(49) :(

- anonymous

55* tan(49)

- Wolfboy

I. Thought sooo......hmmmmmm

- Wolfboy

Sooo we need the formula for tan or a couculater

- anonymous

63.27?

- anonymous

Yes. Let me just show you the last 2 steps.
You got as far as
tan(49) = x/55
multiply both sides by 55. That's basic algebra, solving for x.
55*tan(49) = x
tan of 49, when you put in your calculator is 1.15036841
and
55*(1.15036841) = 63.2702625
then, of course you round to the nearest hundredth.

- anonymous

Thank you dollface :D Sorry if I frustrated you :c

- anonymous

You didn't, cutesie buttons. I'm happy to help. =)

- anonymous

Yay :D

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