[填空题]
A container has the shape of a ra;1i)igrcb7v 3 om)yx ight circular cylinder, as sdmft+wuo ) tr4r9u8k/hown in the left diagram below. The height of the container is 5 cm, and the to)rur k4t m+ udw8f9/diameter of the cylinder's base is 8 cm.
1.Find the volume of the container, V. $cm^3$
A cup full of water has the shape of hemisphere, as shown in the right diagram above. The water from the cup is poured into the container and fills one third of the container.
2.Find the radius of the cup, r. cm