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anonymous
 one year ago
D(5, 7), E(4, 3), F(8, 2), form the vertices of a triangle . what is m<DEF ?
anonymous
 one year ago
D(5, 7), E(4, 3), F(8, 2), form the vertices of a triangle . what is m<DEF ?

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.030° 45° 60° 90° HELP 😩

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Plot 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
 one year ago
Best ResponseYou've already chosen the best response.0Have you learned about Cosine Law?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0No & I have no paper . I'm doing Plato .

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0😵😵 where the points ? Or how do I read this graph 😨

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0They 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
 one year ago
Best ResponseYou've already chosen the best response.0I dont understand what the question means @Nixy, what is m<DEF?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Measurement of angle DEF ?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0& I would type cos .... I'm confused

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0sorry, normally slope is indicated by the letter m, so wasnt sure!

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0need to explain rationale for using cosine law to @Jade3115

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I'm being timed 😩 so I'm going to have to guess

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I've spent 15 mins on one question .

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0distance 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
 one year ago
Best ResponseYou've already chosen the best response.0Do I pit cos before that ? @nixy

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Jade, 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
 one year ago
Best ResponseYou've already chosen the best response.0Ugh. Thanks anyway .

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Do you understand the distance formula?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0No. I don't understand none of this stuf . That's why I'm doing this now

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0why use the distance formula when answers are degrees?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0You need the sides to get the degree. ONce you have the sides you can use Cosine Law to get the degrees

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0okay @Jade3115 is suggesting that the angle you are looking for is opposite one of the sides.dw:1435458749504:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ha!, what @Jade3115 forgot to mention was that you were not given the lengths of the sides or any angles.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Sorry, 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
 one year ago
Best ResponseYou've already chosen the best response.0I have just become a fan of @Jade3115 knowing where she was going with this.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Once she has the the sides she can use formulas like the following to find the angles \[ \huge cos^{1} E = \frac{b^2+c^2a^2}{2bc} \] To find the

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0But this solution obviously mean calculating the sides, as @Jade3115 said. Her solution was right.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0How 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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