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cutiecomittee123
 one year ago
Find the measure of angle b
find x
find y
cutiecomittee123
 one year ago
Find the measure of angle b find x find y

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cutiecomittee123
 one year ago
Best ResponseYou've already chosen the best response.1dw:1441845503857:dw

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.3dw:1441846059967:dw

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.3using A as a reference angle, we can add these labels dw:1441846105403:dw

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.3find x and y using the trig ratios then find angle B

cutiecomittee123
 one year ago
Best ResponseYou've already chosen the best response.1i need more pointers, @jim_thompson5910

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.3how far did you get @cutiecomittee123 based on the info I posted?

cutiecomittee123
 one year ago
Best ResponseYou've already chosen the best response.1no where lol let me try again

cutiecomittee123
 one year ago
Best ResponseYou've already chosen the best response.1well i kind of took the easy way out and I just figured there are 180 degrees in a triangle and it is given 90+75 so i added them and got 165 then if you add 15 you get 180 so obviousely angle b is 15 degrees. but then to solve for x and y i can easily see that you just use the trig stuff

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.3yes B = 15 degrees

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.3how would you find x?

cutiecomittee123
 one year ago
Best ResponseYou've already chosen the best response.1I am having a brain fart and cant remeber

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.3dw:1441853405825:dw

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.3which angle do you want to use? A = 75? or B = 15?

cutiecomittee123
 one year ago
Best ResponseYou've already chosen the best response.1well lets use B, and wouldnt you use cos because you would do adjacent over hypotenuse? So it would be cos(15)=125/y

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.3dw:1441853613668:dw

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.3cos(B) = adjacent/hypotenuse cos(15) = 125/x now solve for x

cutiecomittee123
 one year ago
Best ResponseYou've already chosen the best response.1So wouldnt you take the inverse of both sides?

cutiecomittee123
 one year ago
Best ResponseYou've already chosen the best response.1sorry for the super late replies i am also working on a power point.

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.3it's ok, work on the powerpoint first and we can work on this later

cutiecomittee123
 one year ago
Best ResponseYou've already chosen the best response.1Alright done with the presentation, lets do this:)

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.3so you see how I got `cos(15) = 125/x` right?

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.3using a calculator, what is the value of `cos(15)` equal to (in terms of a decimal number)

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.3so what we really have is `0.97 = 125/x` are you able to solve that for x?

cutiecomittee123
 one year ago
Best ResponseYou've already chosen the best response.1hmm, multiply both sides by x?

cutiecomittee123
 one year ago
Best ResponseYou've already chosen the best response.1divide by .97

cutiecomittee123
 one year ago
Best ResponseYou've already chosen the best response.1on both sides

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.3what is x equal to

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.3ok so 125/0.97 = 128.87 is correct it turns out that 125/(cos(15)) = 129.40952255126 is the more accurate answer so it might be best to type into your calculator `125/(cos(15))`

cutiecomittee123
 one year ago
Best ResponseYou've already chosen the best response.1okay cool got it, but why would you divide it form 125?

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.3\[\Large \cos(15^{\circ}) = \frac{125}{x}\] \[\Large \cos(15^{\circ})\color{red}{*x} = \frac{125}{x}\color{red}{*x}\] \[\Large \cos(15^{\circ})\color{black}{*x} = \frac{125}{\cancel{x}}\color{black}{*\cancel{x}}\] \[\Large \cos(15^{\circ})*x = 125\] \[\Large \frac{\cos(15^{\circ})*x}{\color{red}{\cos(15^{\circ})}} = \frac{125}{\color{red}{\cos(15^{\circ})}}\] \[\Large \frac{\cancel{\cos(15^{\circ})}*x}{\cancel{\cos(15^{\circ})}} = \frac{125}{\color{black}{\cos(15^{\circ})}}\] \[\Large x = \frac{125}{\color{black}{\cos(15^{\circ})}}\]

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.3So what I first did was multiply both sides by `x` then I divided both sides by `cos(15)`

cutiecomittee123
 one year ago
Best ResponseYou've already chosen the best response.1i see you just solved it like an algebraic equation, basic algebra

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.3yeah if you have to, think of `cos(15)` as y so you'd have y = 125/x solving for x gives x = 125/y

cutiecomittee123
 one year ago
Best ResponseYou've already chosen the best response.1okay woah, so now y=129.41 and then we can just use the pythagorean theorum to solve for x. so 129.41^2+125^2=x^ added together i get 32302.1396 the square root of that is 179.72796 so x=179.73

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.3no, I let y = cos(15) so y = 0.97 like you got, but it's best to leave the cos(15) part alone as it is

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.3if you typed 125/cos(15) into a calculator, what do you get?

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.3yes, 125/cos(15) = 129.40952255126

cutiecomittee123
 one year ago
Best ResponseYou've already chosen the best response.1which is what the side y is equal to

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.3oh my bad, I picked y when y is already being used in the drawing

cutiecomittee123
 one year ago
Best ResponseYou've already chosen the best response.1yeah lol oops. but yes I think we have it all figured out now. thanks so much!!!!

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.3you're welcome
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