Question

D(5, 7), E(4, 3), F(8, 2), form the vertices of a triangle . what is m 10 years ago

Answer 1

30°
45°
60°
90°
HELP 😩

Answer 2

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.

Answer 3

Have you learned about Cosine Law?

Answer 4

No & I have no paper . I'm doing Plato .

Answer 5

here is the graph:

Answer 6

😵😵 where the points ? Or how do I read this graph 😨

Answer 7

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

Answer 8

I dont understand what the question means @Nixy, what is m<DEF?

Answer 9

Measurement of angle DEF ?

Answer 10

& I would type cos .... I'm confused

Answer 11

sorry, normally slope is indicated by the letter m, so wasnt sure!

Answer 12

need to explain rationale for using cosine law to @Jade3115

Answer 13

I'm being timed 😩 so I'm going to have to guess

Answer 14

Timed?

Answer 15

I've spent 15 mins on one question .

Answer 16

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.

Answer 17

Who is timing you?

Answer 18

The computer

Answer 19

Do I pit cos before that ? @nixy

Answer 20

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.

Answer 21

Ugh. Thanks anyway .

Answer 22

Do you understand the distance formula?

Answer 23

No. I don't understand none of this stuf . That's why I'm doing this now

Answer 24

why use the distance formula when answers are degrees?

Answer 25

😂😂

Answer 26

You need the sides to get the degree. ONce you have the sides you can use Cosine Law to get the degrees

Answer 27

okay @Jade3115 is suggesting that the angle you are looking for is opposite one of the sides.