Question

The radius of a circle is 1 what is the measure in radians of the angle subtended by an arc Pi Long

Answer 1

`\begin{gathered} An\text{ angle }\theta\text{rad substended by an arc of length s is given:} \\ \theta=(s)/(r) \\ \text{where r is the radius of the circle the arc is a part of} \\ In\text{ this case s }=\pi,\text{ and r=1} \\ so\text{ the angle is }(\pi)/(1)=\pi\text{ radians} \end{gathered}`