Question

The radius of a circle is 11. what is the length of an arc that subtends an angle of pi/2 radians

Answer 1

`\begin{gathered} \text{the lenght of an arc that subtends an angle of }\theta\text{ is } \\ L=r\theta \\ \\ \text{thus } \\ L=11\cdot(\pi)/(2) \\ \\ L=(11)/(2)\pi \\ \\ \text{ } \end{gathered}`