11.4 – Circumference and Arc Length. Circumference: C =  dC = 2  r Length around a circle.

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Presentation transcript:

11.4 – Circumference and Arc Length

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

Arc Length: Length around an arc

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

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

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

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

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

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

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

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