Question

find lenght of arc AB https://wbasecure.aplusanywhere.com/R85Content/media/pictures/geo_nbg/g2919t1.gif?ts=1407600620536

Answer 1

cidney-morgan

Answer 2

sorry i spelled it wrong

Answer 3

and i forgot the at sign

Answer 4

You tag someone by doing an '@' and then there username

@ + Cydney_morgan

Answer 5

Oh ok :)

Answer 6

yea i forgot

Answer 7

it´sjust that im on vacation and i wanna got to the beach but i cantuntil i finnish this

Answer 8

Do you know how to do this your self?

I will guide you through it.

What do you think the first step is?

Answer 9

honestly i dont have a clue about any of this i just played my way through the class

Answer 10

That's not good. :(

But please remember we are not here to give you the answer, we are here to help you learn . The first step to finding the answer is: (I'm writing it below)

Answer 11

wow u talk like a teacher

Answer 12

Dear Ralphie, your present situation is one outcome of your "playing your way through class."

this problem involves "arc length." The formula for arc length is\[s=r*\theta,\]where r is the length of the radius, theta is the central angle, and s is the arc length in the same units of measurement as the radius has.

Answer 13

ok

Answer 14

i know i played my way through class played around with girls made jokes but forgett that im here to earn

Answer 15

@mathmale can explain this WAY better than I can. I will stay and watch and and put input were it is needed though :)

Answer 16

Be sure you know that In a circle, the degree measure of an arc is equal to the measure of the central angle that intercepts the arc.

Answer 17

ok thanks cydney

Answer 18

In a circle, the length of an arc is a portion of the circumference.

You will use a formula to find the Arc, as Mathmale just gave you.

Answer 19

ok

Answer 20

how do i use the formula

Answer 21

Hold on

Answer 22

im sorry for the bother cydney but i really didnt pay attention in class

Answer 23

i really apreciate the help ur giving me

Answer 24

It is alright, hold on I'm going to explain.

Answer 25

ok let me write this down

Answer 26

sorry he left

Answer 27

It is alright, here, @phi do you know if I am explaining this correctly? I dont want to be giving false info.

Answer 28

ok no prob

Answer 29

yes, the ratio idea is good (should be easy to understand)

Answer 30

ok

Answer 31

It is common sense

360º is all the way around the circle
what fraction is 120º of a circle ?

Answer 32

kid i have no clue srry

Answer 33

Thank you for helping me to explain @phi


@Ralphie phi is not a kid.

Answer 34

oops sorry

Answer 35

We are not here to give you the answer you must try and make an effort. May you at least try?

Answer 36

wait u said ur 14 right?

Answer 37

Yes.

Answer 38

Do you get that going all the way round the circle is 360º ?

Answer 39

wow ur stict for a 14 yearold girl

Answer 40

strict

Answer 41

Please focus on the problem.

Answer 42

ok

Answer 43

yes i understand that phi

Answer 44

any idea how many degrees is ½ round ?

Answer 45

180

Answer 46

and if you went 180 degrees out of 360, you can write 180/360
simplify that to ½

use that idea for 120º out of 360º

Answer 47

hey i didnt pay attention but it doesnt mean im dumb

Answer 48

No one said you were dumb, we are trying to teach you.

Answer 49

i know i was kidding

Answer 50

the answeris 3

Answer 51

You should have enough information now based off of the information @phi and I have given you. Are you still confused?

Answer 52

you should find 120/360 is the fraction of the circle you go around

that simplifies to ⅓

Answer 53

ok

Answer 54

now if you knew how far in distance it is around the whole circle, you would do ⅓ of that to find the length of the arc.

Answer 55

^^^

Answer 56

there is a famous formula
C= 2 pi r
where C is the distance around the circle, and r is the radius
pi is 3.14159


but lots of times we just leave it pi. Depends if your answer choices are a decimal or have pi in them.

Answer 57

That is true, Ralphie what are your answer choices?

Answer 58

there arent any choices i have tobe 100% correct

Answer 59

What do you believe the answer is then?

Answer 60

the only thing it says is Type the correct answer, rounded to two decimal places, then press Enter

Answer 61

Well what do you think the answer is? We have given you a lot of information you should be able to do this yourself, I know you can!

Answer 62

hold on gimme a sec

Answer 63

rounded to two decimal places means the answer is a decimal number.
which means use pi= 3.14159 (or whatever your calculator uses... it has a pi key)

Answer 64

The next step is find C using
C = 2 pi r
where r is given in the problem

Answer 65

@Phi you are much better at explaining this then me thank you.

Answer 66

i believe the answer should be 20.93333333333

Answer 67

is this correct?

Answer 68

for C (the distance around the circle) ?

Answer 69

no for the arc

Answer 70

AB

Answer 71

what did you get for C ?

Answer 72

i didnt do c

Answer 73

C= 2 pi r

Answer 74

that is 62.8

Answer 75

if you are going to round to 2 decimal places you need to keep track of *at least* 3
you only show 1 (the .8)

Answer 76

^^^ Phi is right.

Answer 77

well where am i supposed to get the other 2? mycalc gives me 62.8

Answer 78

you must have it set to round to 1 digit.

if all else fails
type
2*pi*10=
in the google search window.

Answer 79

ok

Answer 80

i still got 62.8