Question

Could someone see if my answer is correct?

Answer 1

Hello

Answer 2

HINT: Use Sines or Cosines for this question.

Answer 3

\(PQ^{2}=RP^{2}+RQ^{2}-2\times RP\times RQ\times cosR\)

Answer 4

That's what I did.

Answer 5

I end up with cos^-1 (1.20)

Answer 6

Then when I put that on the calculator, I don't have any answer.

Answer 7

it cannot be \(1.2\) because the biggest cosine can be is 1

Answer 8

Hey @satellite73 I need your help on this. I already started but I don't have the right answer.

Answer 9

\(cosR=\frac{529}{1239}\)

Answer 10

Are you looking for the degree outside the triangle or inside?

Answer 11

It's looking for the measurement of the angle to the nearest degree.

Answer 12

@JungHyunRan it's that 520/1220?

Answer 13

Answer is: 65 degrees. :)

Answer 14

How though?

Answer 15

Quick calculator. I'll try to find the steps for you though. :) Hold on.
http://ostermiller.org/calc/triangle.html

Answer 16

I got it now, I tried it.

Answer 17

529/1239

Answer 18

@JungHyunRan I got 43/413

Answer 19

@Blank I have one more question.

Answer 20

Sure

Answer 21

@Blank  you there lol.

Answer 22

Yeah, this one is tricky.

Answer 23

We're looking for AC, I think it might be 18 because that's what's between. I'm not sure.

Answer 24

Funny thing is that it has to be equaled to 18. You don't have a choice like that. Maybe the choices or pic has a typo. The triangle is an equilateral.

Answer 25

Never mind, the triangle is almost equilateral. The side is probably 17.7

Answer 26

Answer is A. 17.7

Answer 27

sorry I'm late

Answer 28

It could be @Blank  are you satisfied with that answer lol..

Answer 29

@blank I have probably two more questions.

Answer 30

Or one.

Answer 31

Hey @Blank 

Answer 32

Sorry, Yeah I'm here.

Answer 33

Answer is 68.6 m

Answer 34

Yes! I was correct.

Answer 35

Alright, last one for tonight.

Answer 36

Yes, How do you know when to use the Law of Sines or the Law of Cosines to solve a triangle?

Generally, the Law of Cosines is used when SSS or ASA are known. The Law of Sines is used when SAS or AAA are known.
Generally, the Law of Cosines is used when SSS or SAS are known. The Law of Sines is used when ASA or AAS are known.
Generally, the Law of Cosines is used when ASA or AAS are known. The Law of Sines is used when SSS or SAS are known.
Generally, the Law of Cosines is used when SSS or AAS are known. The Law of Sines is used when SAS or AAS are known.

Answer 37

Generally, the Law of Cosines is used when SSS or SAS are known. The Law of Sines is used when ASA or AAS are known.

Answer 38

Hope that helps. :)

Answer 39

Got my info from: http://illuminations.nctm.org/Lesson.aspx?id=2441
Bottom of the page. :)

Answer 40

Hey man, I really appreciate your help. I passed the quiz.

Answer 41

Nice, Good to hear. :)

Answer 42

I'm going to work on my World Geography, but if you don't mind if I could message you tomorrow to help me with some more?

Answer 43

Only the questions that I don't know.

Answer 44

Or having trouble on.

Answer 45

What time will you be on time?

Answer 46

Ha, believe me too man. This year is a struggle. What grade you in?

Answer 47

Alright, just message me when you're on.

Answer 48

Trying to graduate early ha? I'm in 10th.

Answer 49

Goodnight

Answer 50

You know what man, I'll let you get some sleep. Goodnight.