Coverage of the Boxing ring

How do I calculate the coverage size that you need? - for a floor ring with a combat zone of 5x5 m, - it is necessary to cover 6, 5x6, 5 m, so you need to add 1.5 m to each side of the size of the combat zone, then calculate the area and substitute the number in the graph. (The ring with a fighting area of 4x4 m, the coating should be 5,5x5,5 m, is 30,25 m2) - for the ring on the platform - consider the size of the platform and add the area of the "skirt ring" (The ring on the platform of 5x5 m, military area 4x4 m, platform height 0.5 m, the covering should: 1. horizontal area of 5x5 m = 25 m2 2. vertical area (ring skirt = Length x Height x 4 sides) 5 m x 0.3 m x 4 PCs. = 6 m2 3. we get the total area of 25 m2 + 6 m2 = 31 m2