A cyclist accelerates uniformly from rest. After 8.0s the wheels have rotated 3 rev. What is the angular acceleration of the wheels?

Answer:$\displaystyle 0.59rad/s^2$

this is what I did: $\displaystyle \theta = \theta_o +\omega_o t + \frac{1}{2} \alpha t^2 \Leftrightarrow \alpha=\frac{2\theta}{t^2}=\frac{2(3(2\pi)))}{(8s) ^2}$

stupid me I forgot one of the 2xPi