Question

Use the circle in the URL. Find the length s to the nearest tenth of a foot.

http://mapleta.mivu.org/mapleta/web/Alg2aMm000/Public_Html/Algebra%202A%20Unit%20Test/unit%204/cp%204.6-4.7%20Q4.jpg

Answer 1

consider the circumference of a circle as "s"; the angle swept out in radians of a full circle is 2pi

(2pi) r = s; we can generalize this to any angle swept out in radians

(a) r = s

Answer 2

7pi.5
----- = 7pi
5