If the curve of the standard 400m runway is semicircle, and the radius of the innermost curve is 36m, and each runway is 1.2 wide, there are six runways 1. What is the radius of the semicircle runway on the outer circle? 2. How many meters ahead of the starting point of the first runner in the 200 meter race? 3. How many meters ahead of the starting point of the third runner in the 400 meter race? 4. If the 400 meter race is still in progress, how many meters ahead of the first runner is the fifth runner?

If the curve of the standard 400m runway is semicircle, and the radius of the innermost curve is 36m, and each runway is 1.2 wide, there are six runways 1. What is the radius of the semicircle runway on the outer circle? 2. How many meters ahead of the starting point of the first runner in the 200 meter race? 3. How many meters ahead of the starting point of the third runner in the 400 meter race? 4. If the 400 meter race is still in progress, how many meters ahead of the first runner is the fifth runner?

1. The radius of the outer ring is 36 + 1.2 * 6 = 43.2m
2. The radius of the second track is 36 + 1.2 = 37.2, and the half circumference is 3.14 * 37.2 = 116.808
The radius of the first track is 36, and the circumference of the half track is 3.14 * 36 = 113.04
116.808-113.04=3.84m
3. The radius of the third track is 36 + 1.2 * 2 = 38.4, and the circumference is 3.14 * 2 * 38.4 = 241.152
The radius of the first track is 36, and the circumference is 3.14 * 2 * 36 = 226.08
226.08-241.152=15.072
4. The radius of the fifth track is 36 + 1.2 * 4 = 40.8, and the circumference is 3.14 * 2 * 40.8 = 254.592
254.592-226.08=28.512

The innermost circle of the standard track and field track is 400 meters. If each track is 1.2 meters wide, the starting line of the second and third track should be () meters apart

3.14 * 2.4 / 2 = 3.768m
2.4 is the increased diameter of the circle
3.14 * 2.4 is the circumference of the circle
Divide by 2 to be a semicircle