Question

Find the value of a.

8.6

7.2

30.5

5.5

Answer 1

use cosine rule

Answer 2

can you help me get the answer?

Answer 3

yep
its easy
but u have to ans my question as i ask

Answer 4

ok so what do i do

Answer 5

do u know cosine rule?

Answer 6

yeah use law of cosines...there are certain formulas

Answer 7

a^2 = b^2 + c^2 - 2bc cosA

Answer 8

right. it looks like you already have two sides and an angle (this is SAS triangle), so you could probably start by plugging in your values to solve for side a

Answer 9

Can you do this? @Addicto_

Answer 10

so would it be a^2 = 4^2 + 7^2 - 2 * 4 *7 cosA

Answer 11

a^2 = 16 + 49 - 56
a^2 = 9

Answer 12

a = 3 ?

Answer 13

almost right! but remember, for cosA, you can actually say \(cos~52\)

Answer 14

yep!!!!!!!!!!!!!

Answer 15

ohh i forgot that so how would i finish with it being cos 52

Answer 16

here's the process...I'll write it all out, might take a minute

Answer 17

ok

Answer 18

so i hope u getting it @Addicto_

Answer 19

yea im starting to understand now

Answer 20

i hope u r allowed to use log books @Addicto_

Answer 21

plz hurry i have to go soon

Answer 22

a^2=4^2 +7^2 +2(4)(7)Cos 52
a^2=65+56Cos52
a^2 =99.477
a=9.97

Answer 23

sorry for the delay

Answer 24

you would just plug in 56Cos52 into your calculator, and that should give you the answer

Answer 25

use log book

Answer 26

wait..how do i do that

Answer 27

hope this helped you...if there's any step i can clarify, let me know!

Answer 28

ok now im confused

Answer 29

hmm what @Addicto_ ?

Answer 30

how do i do 56cos52 to get the answer?

Answer 31

u can use log book

Answer 32

omg i dont think i'll ever get the answer -.-

Answer 33

y

Answer 34

do u know how to use it?

Answer 35

no

Answer 36

You can use a calculator to solve the final value

https://www.google.com/search?q=56cos52&rlz=1C1GGGE_enUS424US424&oq=56cos52&aqs=chrome..69i57&sourceid=chrome&es_sm=122&ie=UTF-8#q=56+cos(52+degrees)

Answer 37

hmmm

Answer 38

gtg bbye
have a great day @Addicto_

Answer 39

when i solved it i got that answer @TheSmartOne

Answer 40

but its not in the choices

Answer 41

so will it be 30.5

Answer 42

@TheSmartOne ?

Answer 43

\(\color{blue}{\text{Originally Posted by}}\) @Jamierox4ev3r
a^2=4^2 +7^2 +2(4)(7)Cos 52
a^2=65+56Cos52
a^2 =99.477
a=9.97
\(\color{blue}{\text{End of Quote}}\)

Answer 44

:o I did good things! thanks for the reinforcement @TheSmartOne

Answer 45

:D

Answer 46

wow...my first medal in months *_*

Answer 47

i have one more question like this, so will any of u help me if i post another questin like this ?

Answer 48

hellooooooooooooooooo?

Answer 49

ugh -.-