Question

Find the length of an arc of 40° in a circle with an 8 inch radius.

Answer 1

the circumference of a circle is

\[C = 2\pi r\]

the fraction of a circle you are dealing with is

\[\frac{40}{360}\]

so the arc length is the fraction of the circumference or

\[l = \frac{40}{360} \times 2\pi r\]

substitute r = 8 and calculate the answer

Answer 2

What's the answer?

Answer 3

just calculate it here is a calculator if you need it

http://web2.0calc.com/

Answer 4

8pi/9 inches. That's what i got, is that correct?

Answer 5

I would have thought it was

\[l = \frac{2\times \pi \times 8}{9}\]