Question

The radius of a circle is 1. what is the length of an arc that subtends an angle of 31pi/25. radians?

Answer 1

$\begin{gathered} \text{Length of Arc = Radius }\times\text{ Angle substended in Radian} \\ \text{Length of Arc = 1 }\times\text{ }\frac{31\text{ pi}}{25} \\ \text{ = }\frac{31\text{ pi}}{25} \end{gathered}$