## anonymous 5 years ago Find the length of a 40 degree arc in a circle with a radius of 4

1. anonymous

|dw:1327427504346:dw|

2. anonymous

C=(180-40)/2=70

3. amistre64

arcLength = 40*4pi/180

4. anonymous

$CH=\cos (70) * radius(4)$

5. anonymous

BC=2CH because AB=AC and CH=BH

6. amistre64

arc length is just part of a circumference; C = 2pi r arc length = angle * radius ; whenere the angle is in radians

7. amistre64

i think ali might of read it wrong to begin with ...