In the center of a primary school, there is a circular fountain with a diameter of 8 meters and a depth of 0.6 meters ① There are 10 cone-shaped stones in the fountain to install the nozzle. The bottom radius of each stone is 3 decimeters and the height is 4 decimeters. Please calculate the space occupied by these stones ② To make the nozzle spray water normally, it is necessary to put 0.5m deep water into the pool. What is the volume of water? ③ If you want to build a 1 meter wide circular road on the edge of the pool, how many square meters is the area of this road?

1、 If V1 = (1 / 3) * 0.4 * pi * (0.3) ^ 2, then v = 10v1
2、 V water = pi * 4 ^ 2 * 0.5-10v1
3、 S = pi * (5 ^ 2-4 ^ 2)

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