Math Question

[sr71blackbird]

I may have a shot at another job in my company, but I need to take a test that involves math. Im not good at math at all! Im told that the test will have sine, cosine, and tangent equations (forgive my spellings if they are wrong), as well as finding the area of a triangle.

Anyone have any pointers or direction? What kind of math is that anyway? Algebra? Trig?

What can I learn or practice that will help me pass this test?

Believe it or not, I dont even know how to do long division effectively!

Help!

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[Hottub]

Start here. Basically Trig for Dummies. (http://aleph0.clarku.edu/~djoyce/java/trig/)



Best of luck to you, Bro!!!!

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[sr71blackbird]

Thanks! Im hoping I can bring a calculator!

so far I got

c2=a2+b2

squared meaning x2, right?
So, if one side is 8, then its really 16?

I know this might sound crazy for those who are adept at these kinds of things, but I always drew a blank when I had to learn this stuff in school

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[Tazz]

squared meaning x2, right?


Squared means times itself bro.

8 squared is 64

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[TooCute]

SOHCAHTOA

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[Hottub]

WOW!

Nice job TC

Major Mrs. schaefer flashback!!

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[sr71blackbird]

Thanks for the help! Whats SOHCAHTOA again?

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[BoondockSaint]

It means you don't know it and you're screwed. Get a scientific calculator and hope they let you use it.

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[Tazz]

What kind of work do you do that you would have to know this stuff?

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[BoondockSaint]

He's a high school math teacher.

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[Crippler]

Thanks for the help! Whats SOHCAHTOA again?

sin = opposite/hypotenuse
cos = adjacent/hypotenuse
tan = opposite/adjacent

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This message was edited by Crippler on 10-28-04 @ 10:24 PM

[JPMNICK]

You can PM me with specific questions you have. Not only have I taken more college level math than you can imagine (2 engineering degree's). But I also tutor in highschool math, which it sounds like what is going to be on this test.

You should look into online SAT reviews.

Type of math would be geometry, which is taught at a freshmen or sophmore level in high school in NJ. You could go to the state website and look at the core corriculum. they will have individual topics you can research.

there are also things called unit triangles. they have one side with a 90 degree angle. then the 2 other angles are either 45 and 45 or 30 and 60.

each leg of the triangle will be labled. from there you can derive to sine cosine and tangent.

.http://id.mind.net/~zona/mmts/miscellaneousMath/tri454590306090/t454590.gif




http://id.mind.net/~zona/mmts/miscellaneousMath/tri454590306090/t306090.gif




Disregeard the decimal equivelant. just memorize the numbers on the outside and the shape and angle.


quick hint - all the angles of a trianlge must add up to 180 degrees. so if you have 2 angles 63 and 47 you know the third must be 180 - (63+47)



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This message was edited by JPMNICK on 10-28-04 @ 11:02 PM

[Mike Teacher]

dont forget the triangles where each vertex is a 90 degree angle making the sum 270 instead of 180.



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[JPMNICK]

i do not think he will have something like that. or at least i hope not

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[Mike Teacher]

Yeah its a smarmy post. Anyway, like Nick is alluding too, on a sphere a triangle can have 90 degree angles.

Weird imaginary trip: Someone tellse you: Start at North Pole, go in a straight line to the equator, turn 90 degrees left , go east same disatance, turn 90 degrees left again due north, and youre three 90 degree turns take you back to the north pole.

Ignore all of this and learn the basics that Too Cute and JPM and others have most excellently described.

I'm looking at a right triangle with a side of a measure of 1. Pythagoream Theorum say that hypotenuse = Square Root of Two. Which it is, and which caused Early mathematicians everywhere a whole lotta grief and gnashing of teeth. The behavior was seriously irrational. Anyone know why?



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This message was edited by Mike Teacher on 10-28-04 @ 11:58 PM

[JPMNICK]

we should try and stick to 2 dimmensional math!

unless you want me to break out my Materials Science knowledge and we can start doing x-ray diffraction through BCC Iron.


Is there going to be stuff on parabola's on there?



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[JPMNICK]

BTW- area of a triangle is always

1/2 of the Base multiplied by the height


if the triangle does not have a 90 degree angle, meaning no one side who is the height, you need to derive it from the other side

.http://www.loisterms.com/lois8a.gif

The dotted line is the height.


Here is another example:

http://www.btinternet.com/~se16/hgb/trianglelengths.gif

Another equation you could use which is very easy is

Area = a*b*sin(C)/2

Notice where the small a and b are and the Capital C.





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This message was edited by JPMNICK on 10-29-04 @ 12:59 AM

[sr71blackbird]

What kind of work do you do that you would have to know this stuff?


Well, I work for a utility company and they have job postings within the company and the one that I want to take is for "system mapper" and what it basically is is helping to create and modify existing electric maps using this software. Ive seen people doing it and it doesnt look to hard (and I imagine that most of the people who are doing it wouldnt be able to do it without that software!). I current use a similar mapping software now for the gas lines and this would be a whole differnt job in a differnt part of the company. Oddly, the position Im in now didnt have any prerequisits like this one has, so maybe they are trying to "thin the herd". I dont think that Id need to do any calculations like that on the job itself, but I guess they prefer if their people could be usefull should the mapping program fail or whatever. Its kind of interesting none the less and Id make more $, which is good!

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This message was edited by sr71blackbird on 10-29-04 @ 8:32 AM

[JPMNICK]

BTW, good luck with the new position

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[TheRealEddie]

Yeah its a smarmy post. Anyway, like Nick is alluding too, on a sphere a triangle can have 90 degree angles.

Weird imaginary trip: Someone tellse you: Start at North Pole, go in a straight line to the equator, turn 90 degrees left , go east same disatance, turn 90 degrees left again due north, and youre three 90 degree turns take you back to the north pole.


Well duh, Mr. Smarty Pants. everyone knows that the S^2 is not topologically isomorphic to the plane, or R^2. Which btw results in the fact that there is no single two coordinate paramterization that completely covers the sphere. But I have a feeling that his test will stick to geometry in linear, i.e. Eulcidean spaces, and not delve into differentiable manifolds. ;)

I have a feeling it will be just the basics.



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Just doing my part to bring the average intelligence level of this thread back to par.

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