anonymous
  • anonymous
D(5, 7), E(4, 3), F(8, 2), form the vertices of a triangle . what is m
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
30° 45° 60° 90° HELP 😩
anonymous
  • anonymous
Plot it out on graph and use the distance formula to get the three sides and then you can use Cosine Law to figure out the angles.
anonymous
  • anonymous
Have you learned about Cosine Law?

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anonymous
  • anonymous
No & I have no paper . I'm doing Plato .
anonymous
  • anonymous
here is the graph:
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anonymous
  • anonymous
😵😵 where the points ? Or how do I read this graph 😨
anonymous
  • anonymous
They did not give you a distance for none of the sides so to me it looks like you need to find the sides and use Cosine Law, which you can find the sides using he distance formula Here are your points https://www.desmos.com/calculator/zbzs1dzyyp
anonymous
  • anonymous
I dont understand what the question means @Nixy, what is m
anonymous
  • anonymous
Measurement of angle DEF ?
anonymous
  • anonymous
& I would type cos .... I'm confused
anonymous
  • anonymous
sorry, normally slope is indicated by the letter m, so wasnt sure!
anonymous
  • anonymous
need to explain rationale for using cosine law to @Jade3115
anonymous
  • anonymous
I'm being timed 😩 so I'm going to have to guess
anonymous
  • anonymous
Timed?
anonymous
  • anonymous
I've spent 15 mins on one question .
anonymous
  • anonymous
distance formula = \( \sqrt{(x_2 - x_1)^2+(y_2- y_1)^2} \) D(5, 7), E(4, 3), F(8, 2) So from E(4,3) to D (5,7) \( \sqrt{(5 - 4)^2+(7- 3)^2} \) That will give you the distance from E to D and that is one side.
anonymous
  • anonymous
Who is timing you?
anonymous
  • anonymous
The computer
anonymous
  • anonymous
Do I pit cos before that ? @nixy
anonymous
  • anonymous
Jade, there is a lot of work to do with this problem and to me you have to KNow about the distance formula and Cosine Law so this is going to take a little bit.
anonymous
  • anonymous
Ugh. Thanks anyway .
anonymous
  • anonymous
Do you understand the distance formula?
anonymous
  • anonymous
No. I don't understand none of this stuf . That's why I'm doing this now
anonymous
  • anonymous
why use the distance formula when answers are degrees?
anonymous
  • anonymous
😂😂
anonymous
  • anonymous
You need the sides to get the degree. ONce you have the sides you can use Cosine Law to get the degrees
anonymous
  • anonymous
okay @Jade3115 is suggesting that the angle you are looking for is opposite one of the sides.|dw:1435458749504:dw|
anonymous
  • anonymous
ha!, what @Jade3115 forgot to mention was that you were not given the lengths of the sides or any angles.
anonymous
  • anonymous
Sorry, I am at work so I am in and out :-) @BPDlkeme234 That is why I suggested to her to use the distance formula first to find the sides and then she can use Cosine Law to find the angles
anonymous
  • anonymous
I have just become a fan of @Jade3115 knowing where she was going with this.
anonymous
  • anonymous
Once she has the the sides she can use formulas like the following to find the angles \[ \huge cos^{-1} E = \frac{b^2+c^2-a^2}{-2bc} \] To find the
anonymous
  • anonymous
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anonymous
  • anonymous
But this solution obviously mean calculating the sides, as @Jade3115 said. Her solution was right.
anonymous
  • anonymous
How was her solution correct? She did not have a solution. I am the one that told her she had to calculate the sides and then told her how and from there she has to use Cosine Law to figure the angles. The only solution she had was to guess at a random answer.

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