Question 669447
Here R= 2 cm, r= 1 cm
Volume =(4/3). Pie. (R^3-r^3)
       =(4/3). Pie. (2^3-1^3)
       =(4/3). Pie. (8-1)
       =(4/3). Pie. 7
       =(4/3). 22
       = 88/3 cm^3