finding the measure of arc length

[isu23pink]

"Find the measure of arc length AB"
[attachment=0:hrx94r2y]no.5.jpg[/attachment:hrx94r2y]

okay so this is what i did:
A=B=7
AB=12
2(arc sine 6/7)
=118
118/360(2pi)(r)
= 118/360(2pi)(7)
= (0.3278)(43.982)
=14.417
WRONG.

help, please ?

 

[wjm11]

okay so this is what i did:
A=B=7
AB=12
2(arc sine 6/7)
=118
118/360(2pi)(r)
= 118/360(2pi)(7)
= (0.3278)(43.982)
=14.417
WRONG.

Hello, isu23pink,

Your work looks pretty good (not sure what A=B=7 means though) -- just a little round-off error on your last digit; should be 14.416 if you want three decimal places.

Check directions to see if an "exact answer" or answer in terms of pi or some such is required.

 

[Loren]

With exception of your first line, it looks good to me. How far off are you supposed to be?