How many meters is the plastic track in the school playground?

The plastic track of the school playground is 400 meters in the innermost ring and 453 meters in the outermost ring according to the standard.

It is known that the total length of the standard runway is 400 meters, which refers to the innermost runway length. It is also known that the radius of the innermost runway is 36 meters, the runway curve is semicircular, and the radius of the innermost runway is 36 meters. Each runway is1.2m wide and there are 8 runways.

The standard track and field is a semi-circular 400-meter runway. When the radius of internal bend is 36m, the length of two bends is 228.08m, the length of two straight bends is 17 1.92m, the radius of inner channel is 37.898m, the length of two bends is 240m, and the length of two straight bends is 160m. On the inner edge of the runway, a "bump" with a width of not less than 5cm and a height of 5.0-6.5cm should be built. If no bump is built, a sign line with a width of 5cm should be drawn.

Features:

1. First of all, from the aesthetic point of view, the plastic track of the school playground is perfect in terms of visual comfort compared with the previous cement sand track.

2. In addition, the plastic track material of the school playground has passed the strict quality and environmental protection quality certification, and it is non-toxic and harmless, which truly realizes the comprehensive and healthy sports concept.

In addition to the detailed classification of plastic track in school playground, different types of track materials can not only meet the daily sports needs of the public, but also be well put into various professional competitions, with high comprehensive cost performance.

The most important thing is, for example, after the windy weather, there is a lot of dust on the cement sand runway, which is unsafe, let alone troublesome maintenance. The plastic track in the school playground can completely avoid these defects, which can not only ensure the comfort of sports, but also reduce many unnecessary maintenance costs.