若2弧度的圆心角所对的弧长为4cm,则这个圆心角所夹的扇形的面积是( )
A:2πcm2
B:2 cm2
C:4πcm2
D:4 cm2
看一看,读一读,选一选。
A. Wow! B. How beautiful! C. She's my mother. D. Really? E. Who's that boy?