# Math Help - What is the length of AB

1. ## What is the length of AB

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

2. Originally Posted by Leo34005
What is the length of AB

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
Substitute the given data into the arclength formula (which I'm sure will be somewhere in your notes and/or textbook): $l = \frac{\pi \theta^0}{180} r$.

3. Is the answer 9.77 m?

4. Originally Posted by Leo34005
Is the answer 9.77 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).

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

If its not C, then its A

Edit : Length of Arc

6. Originally Posted by Leo34005

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

If its not C, then its A

Edit : Length of Arc
As I previously said, none of the options are correct.

And it would help if you showed how you're getting your answers.

7. Ok, then let me restate the question for you.

What is the length of

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

Makes sense now?

8. Originally Posted by Leo34005
Ok, then let me restate the question for you.

What is the length of

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

Makes sense now?
Yes. 9.77 m is correct.