[填空题]
A container has the shape of a rigxgq0jal41a ;0lo2 (;lb bj lauht circular cylinder, as shown in thei2gp2f fm l5*pi4 ik8o left diagram below. The height of the containerp48*g ko5fml2ipi2 if is 5 cm, and the 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