Question

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

8pi/9 inches
16pi/9 inches
64pi/9 inches

Answer 1

A full circle is 360 degrees and you are looking at an arc of 40, so that's

40/360 or 1/9

of the whole way around. The whole way around or circumference is:

(2)(pi)(r)

so you want 1/9 of that or:

(2)(pi)(r)(1/9)

So, just put in your value for r into this last equation and you'll have your answer.

Answer 2

If you have any questions on this, just ask, otherwise, are you all good on this now?

Answer 3

The easiest way to find arc length is using s=r*(theta) where s is the arc length and r is the radius and theta is the angle.

Answer 4

use radians....