Question

solve the cos(b)

Answer 1

@mathstudent55 @mathmate

Answer 2

do you know the cos law what say ?

Answer 3

in case of angle B for example

Answer 4

no

Answer 5

you dont learned it again ?

Answer 6

wait yes i do

Answer 7

???

Answer 8

sure ?

Answer 9

yes!

Answer 10

how do i solve for B

Answer 11

cos B = adjacent side divide hypotenuse

do you know this ?

Answer 12

so than how will be ?

Answer 13

cos B = ?

Answer 14

yes i know that @jhonyy9

Answer 15

@Photon336

Answer 16

@mathstudent55

Answer 17

than you need solve it how many will get ?

Answer 18

cos B = ?

B = arccos ?

Answer 19

but i dont get how

Answer 20

cos B = adjacent side divide hypotenuse

adjacent side what is the length of ?

Answer 21

and what is the length of hypotenuse

Answer 22

substitute there please

Answer 23

the length of the hypotenuse is 5

Answer 24

yes and the length of adjacent side ?

Answer 25

3

Answer 26

3 is the opposit side

Answer 27

oh yes

Answer 28

so than cos B = ?

Answer 29

4

Answer 30

divide by 5

Answer 31

wait 4/5?

Answer 32

is that what you want me to do

Answer 33

yes exactly cosB = 4/5

so now B = ?

Answer 34

.8

Answer 35

no

read what i wrote little above

Answer 36

oh

Answer 37

-4/5?

Answer 38

no

cos B = adjacent / hypotenuse

B = arccos a/h

Answer 39

so this will be the value of angle in radiani

Answer 40

i know cos B is 4/5

Answer 41

so b is 5/4

Answer 42

?

Answer 43

no

you know that cos B = 4/5

from this result that B = arccos(4/5)

ok. ?

Answer 44

so B is arccos4/5

Answer 45

yes and than you rewrite it - moment please

Answer 46

i rewrite it to?

Answer 47

looke it here please

http://www.rapidtables.com/calc/math/Arccos_Calculator.htm

Answer 48

wait what do i rewrite it to?

Answer 49

so the answer isnt B arccos 4/5

Answer 50

where you need writing the value of arccos so there write please 0,8 and looke what will get in radiani

Answer 51

you get it ?

Answer 52

no sorry

Answer 53

after you write there 0,8 please push the calculator button there is below of where you wrote 0,8

Answer 54

it doesnt let me write 0,8

Answer 55

so the cos B would be

Answer 56

moment please

Answer 57

what?

Answer 58

looke please on this

Answer 59

i did how did it let you type that it didnt for me

Answer 60

so the answer is 38.87

Answer 61

exactly - so do you understand it now ?

Answer 62

YES THANKS!!!

Answer 63

and this answer is in radiani

Answer 64

ok

Answer 65

np

was my pleasure and anytime

good luck

bye bye

Answer 66

@Kikuo please tag me there