SRL Archive - Mathematics

Well, i'm learning the whole , SIN COS TAN thing, and i get it for the most part, but for some reason, im confused on this one problem..

i r stupod.

Presumably there's a right angle where side x and the side going across the top meet, so there's a total of 90 degrees being shared by those two angles. The second angle should have a measurement of 22 degrees. Since you have an opposite and adjacent angle, you can use tangent, so you'll set up your equation like this:

tan(22) = 20/x

which then simplifies to:

x = 20/tan22

which can be worked out on a calculator.

From: YoHoJo
Any idea what rule your supposed to be using on this? Can you tell me some rules you learned recently? Maybe then I can help me.

It's just simple trigonometry? :confused:

Inside angle on the top is 22*.

tan(22) = 20 / x
0.40403 = 20 / x
0.40403x = 20
x = 49.502

EDIT: Waah, Method winz

He doesn't need to use the law of sines YoHoJo???

Thanks for your guys help, i had no clue …

what do you need trig for? basic algebra could have solved it using pythag. :D

e: nvm. 20 is an angle, not a side :duh:

From: Awkwardsaw
e: nvm. 20 is an angle, not a side :duh:

No, 20 is a side :p

Cause 22 is a angle..

Ahh you guys ended up doing it wrong, oh well.. My teacher said

Since the top line and the bottom line of the triangle are parallel, and theres a transveral in the middle of them(making a Z) then the top degree is the EXACT same as the angle of the triangle(bottom left) so the bottom left would be 68 degrees, and then thats how i was supposed to solve :(.. Oh well, thanks anyway.

well If I would have seen this you would have gotten the right answer :p
sorry, lol.

From: Brain
well If I would have seen this you would have gotten the right answer :p
sorry, lol.

Lol of course, brain has a big brain:)

[QUOTE=Camaro';672780]Ahh you guys ended up doing it wrong, oh well.. My teacher said

Since the top line and the bottom line of the triangle are parallel, and theres a transveral in the middle of them(making a Z) then the top degree is the EXACT same as the angle of the triangle(bottom left) so the bottom left would be 68 degrees, and then thats how i was supposed to solve :(.. Oh well, thanks anyway.[/QUOTE]
Well yes.. But the right top = 90 - 68 = 22 degrees. It really doesn't matter which corner you take ;)
Either
Tan(68) = X / 20
or
Tan(22) = 20 / x

i didn't even read the thread, tangent works too as the people above explained.
weird…I hate it when teachers want it done a certain way and ignore right ways that are different…

From: Brain
i didn't even read the thread, tangent works too as the people above explained.
weird…I hate it when teachers want it done a certain way and ignore right ways that are different…

Tell me about it..

Meh, your diagram doesnt show they are parallel.

line A||B would have done…

Have have you ever considered it could be the teacher that was wrong?

From: mc_teo
Meh, your diagram doesnt show they are parallel.

line A||B would have done…

Have have you ever considered it could be the teacher that was wrong?

My diagram isnt exactly parrallel because i used paint.