3.6 cm/(11000) = 3600 cm = 36 m.

9.6 cm/(11000) = 9600 cm = 96 m.

Outer diameter: 36+1.22 * 8 * 2 = 55.52m.

[(55.52/2)? -(36/2)? ]π+(55.52/2-36/2)*96*2=3277 square meters

3277 m2 * 0. 15m = 49 1.55 m3。

The following is the playground map designed by Linlin (scale: 1: 1000). This stadium has eight runways. On the map, the width of each runway is 0. 122cm, the diameter of the innermost semi-circular runway is 3.6cm, and the length of the straight runway is 9.6cm. 1: the sports ground area is 3,277 square meters. 2. If the stadium is paved with sand with a thickness of 15cm, it needs 49 1.55 cubic meters of sand.