Yucai primary school sports ground has four runways, each with a width of 1 m. The length of the track inside the sports ground is 200 meters, and there is a lawn in the sports ground, which consists

Yucai primary school sports ground has four runways, each with a width of 1 m. The length of the track inside the sports ground is 200 meters, and there is a lawn in the sports ground, which consists of a rectangle and two squares. (1) The radius r= 15.7 16m, and the whole area = π *19.716 *19.716+.

(2) Lawn area =15.716 * 2 * 50+π *15.716 =1571.6+7738.

(3) * * Coal cinder required = (3192.80-2347.55) * 0.3 = 253.575 cubic meters.