Question

What is the arc length of the subtending arc for an angle of 72 degrees on a circle of radius 4? 8 4 5 16 5 8 5

Answer 1

You can calculate the arc lenght by using this formula: 
arc length = 2π*r*(A/360) , where A=angle of the arc. 

So for you it would be: 
arc length = 2π*4*(72/360) = 5.03

I hope that helped.