If a central angle is very small, there is little difference in length between an arc an...

If a central angle is very small, there is little difference in length between an arc and the inscribed chord. See the figure. Approximate each of the following lengths by finding the necessary arc length. (Note: When a central angle intercepts an arc, the arc is said to subtend the angle.)

Length of a Train A railroad track in the desert is 3.5 km away. A train on the track subtends (horizontally) an angle of Find the length of the train.