02-22-2011, 11:11 PM | #1 | |
It's Always Broken.
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Anyone good at math?
Sup guys. I'm having a bit of trouble answering these two problems in my college "Refreshment Math" class.
I know that there is a way I can set up my calculator so I can use TAN to answer them, but I can't figure out how to configure it. Mods, if this breaks rules in any way please close and delete my thread. I just need a little help on this. I just figured this would be the only appropriate section to post this in. In the first problem it is supposed to say, "Find "a" if 0 is 60."
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02-22-2011, 11:15 PM | #2 |
Zilvia FREAK!
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Set your calculator to degrees... sin=opp/adj, cos=adj/hyp, tan=opp/adj. I'd just answer it for you but I don't know what you want me to find in the first one.
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02-22-2011, 11:19 PM | #3 |
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That first question makes no sense, if theta was a 60 degree angle then that would make it a 30-60-90 right triangle, meaning that C would have to be double the length of B, or 46. According to the laws of geometry, A would be 39.84, but that would be assuming that C was following those rules. As for the rules of sine and cosine, I haven't done that for 7 years so I'm pretty rusty.
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02-22-2011, 11:25 PM | #5 | |
It's Always Broken.
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@pacotaco, I don't know how to set it in degrees...I know it'd be something like 90 / 58 = TAN, but Idk, i don't get it.
Here is a better photo of the first question.
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02-22-2011, 11:30 PM | #7 | |
It's Always Broken.
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^Hahaha. I hate math, I just can't understand it.
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02-23-2011, 05:30 AM | #8 |
Zilvia FREAK!
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All interior triangle angles equal 180 degrees. Every time without fail. It's a staple of 8th grade geometry.
So in your problem. you have a 60 degree angle. and a 90 degree angle. Take 180-60-90= answer. Now finding the side lengths "Set your calculator to degrees... sin=opp/adj, cos=adj/hyp, tan=opp/adj." that will work if they allow you to use scientific calculators if not then you'll need to use pytag's theorum. A^2 + B^2 = C^2 Your answer is then simple algebra with square roots.
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02-23-2011, 06:30 AM | #9 |
Zilvia FREAK!
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Hahaha. Triangles. First identify which is Hyp,Adl,opp. Since 60 is in the bottom right corner That tells me that B= adj C=hyp A=opp.
Sin=O/H Cos=A/H Tan=O/A Your trying to find the opp length and you know the adj and hyp sides. Which calculator do you have? I believe it's tan(60)*23=A If I remember right Py's theorum will give him a different answer then he is looking for, But I am not 100% positive.
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02-23-2011, 11:13 AM | #10 | ||
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Using pythagorean I get sqrt(53^2-23^2)=47.75 Using 30-60-90 I get 23*sqrt(3) = 39.84 OR (58/2)*sqrt(3)= 50.22 or sin(theta)=a/c sin(60)*58=a if your calculator is stuck on radians then your angle is (pi)/3 a=50.22 or tan(theta)=a/b tan(60)*23=a a=39.84 etc. Basically, for plane geometry, that triangle is a lie. For the building cos(75)=20/h tan(75)=0/20 75degrees -> radians 75 degrees = 1.30899694 radians (google 75 degrees to radians) Or you could figure it out (pi)/6 is 30 degrees, so (pi)/12 is 15 degrees 75 is 90-15 90 is (pi)/2 (pi)/2-(pi)/12 6(pi)/12-(pi)/12 5*(pi)/12 is the radian equivalent of 75 degrees (5 * pi) / 12 = 1.30899694
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02-24-2011, 09:56 AM | #12 |
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WTF!!! Math??!! hell no!! lol Math gives me headaches, do what I do copy the smart guy next to you JK lol
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02-24-2011, 09:58 AM | #13 |
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Pretty sure the answer is 7.
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02-24-2011, 10:05 AM | #14 |
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its.............
sin (theta)= opposite / hypotenuse sin(60)= a/58 a= 50.22 |
02-24-2011, 12:28 PM | #15 |
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There is no valid answer to the first question. Those dimensions do not result in a right-triangle.
Because it is shown as a right-triangle, Pythagorean Theorem applies: a^2 + b^2 = c^2 or: a = sqrt(c^2 - b^2) a = sqrt(58^2 - 23^2) a = sqrt(3364 - 529) a = sqrt(2835) a = 53.24 However, tan(theta) = Opposite/Adjacent tan(60) = a/b a = b*tan(60) a = 23*tan(60) a = 23*1.73 a = 39.84 Notice that the 2 answers are not the same. Out of curiosity, I drew the triangle in Autocad real fast. Those dimensions result in a 97 deg angle, not a 90 degree angle shown in the bottom left corner.
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02-24-2011, 03:47 PM | #16 |
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pythagorean theorem, a^2 + b^2= c^2
A squared + B squared = C squared where A and B are the adjacent to the right angle and C is the hypotenuse. if you know two of the three you can use algebra to deduce the third number. if i member correctly.
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