The following is a drawing of the sports ground designed by Yang Yang. This sports ground has eight runways. On the drawing, the width of each runway is 0. 1cm, and the diameter of the innermost semicircular runway is 3.6 cm/(11000) = 3600 cm = 36 m.

10cm/( 1/ 1000)= 10000cm = 100m

0. 1cm/( 1/ 1000)= 100cm = 1m

(1) Sports ground area: (1*8+36/2)? π+100 * (1* 8+36/2) * 2 = 2123.72+5200 = 7324 square meters.

(2) Runway area: [( 1*8+36/2)? -(36/2)? ] π+100 *1* 8 * 2 =1105.84+1600 = 2706 square meters.

Sand: 2706*0. 15=406 cubic meters.

(3) 6 * 3 =18m2

You can put it in the semicircle of the runway.