00:01
All right, so we're looking for the arc length, which they use s in the problem, just talk about arc length.
00:12
And when they give you the degree measure, so theta's in degrees, you want to divide it by 360, because you want the proportion out of the full circle times the circumference, which is represented by pi times the diameter.
00:27
So now that we have that formula, i hope that makes sense.
00:31
So you can actually do part a because now you know that it is 50 degrees out of 360 degrees times pi times the diameter, which they give you is 16.
00:45
Now, depending on a teacher, they might want you to leave the answer in terms of pi.
00:50
So let me do that for you.
00:53
And you just do 50 over 360, reduce as a fraction, and then times 16.
00:59
And you'll get 20 pi over 9.
01:02
So this is how i would leave my answer.
01:04
I don't know what units there are.
01:06
Looks like they're meters.
01:08
So m for meters.
01:09
Or if you take that answer and multiply the 20 over 9 times pi, you'll get about 6 .981 meters...