Question

Find the length of an arc of a 8inch radius circle if the arc measures 45 degrees

Answer 1

45° is exactly 1/8 of a full circle (45/360 = 1/8) 
So the length of the arc would be 1/8 of a full circumference: 
C = 2π r 
C = 2π(8) 
C = 16π 

Take 1/8 of this: 
1/8C = (1/8)16π = 2π 

Answer: 
Exact answer --> 2π inches 
(Approx. answer --> 6.28 inches)