1. 11.4 – Circumference and Arc Length

2. Circumference: C =  dC = 2  r Length around a circle

3. Arc Length: Length around an arc

4. 1. Find the circumference of the circle. C = 2  r C = 2  (7) C = 14  cm

5. 1. Find the circumference of the circle. C =  d C =  (13) C = 13  in

6. 2. Find the radius. Round to two decimal places. C = 2  r 48 = 2  r 2  7.64in = r

7. 3. Find the perimeter. Leave answers in terms of pi. A = CircleTwo segments + A = πdπd +2(15) A =9π9π+ 30 ( ) u

8. 360x = 1260  x = 3.5  in Find the length of Leave answer in terms of pi.

9. 360x = 4004  x = 11.12  cm Find the length of Round answer to two decimal places. Leave answer in terms of pi.

10. 6. Find the radius of 170  r = 4320 r = 8.09cm 170 . Round to two decimal places.

11. 132C = 5112 C = 38.73in 7. Find the circumference of. Round to two decimal places.