What is the length of
http://i214.photobucket.com/albums/c...34005/img4.gif
A) about 2.45 m
B) about 28.27 m
C) about 9.77 m
D) about 68.42 m
E) about 34.21 m
Did you mean length of arc or length of chord? The formula I gave in my earlier post was for arc length.
If it's the chord you want, then you should recognise that you have an isosceles triangle and your task is to calculate the length of the base of this triangle. 9.77 m is incorrect - how did you get it? (I get an answer that is none of the options).