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## Homework Statement

Find number of deg. subtendedat the center of a circle by an arc whose length is 357 times the radius,taking pi = 3.1416...

## The Attempt at a Solution

The arc length is... 357(r)

The radius length is r

One revolution = 2r(pi) = arc lenght.

Now I will solve...

2r(pi)x = 357(r)

x = 357/2(pi)

(360 deg = 2r(pi))(357/2(pi))

357(r) = 20454.5 deg.

In the back of the book it says...20.4545

As you can see I am off a couple decimals... what happend?