Rectangle WXYZ has a length of 6 and a width of 2. Rectangle AYZB bisects right cylinders ABC and D. If all the cylinders have the same radius, what is the combined volume of the four half-cylinders?
A.6π
B.9π
C.12π
D.18π
E.21π
我的答案:
Rectangle WXYZ has a length of 6 and a width of 2. Rectangle AYZB bisects right cylinders ABC and D. If all the cylinders have the same radius, what is the combined volume of the four half-cylinders?