How many red tiles does a roof with a length of12.5m and a width of 8.6m need?

About 1500 tiles are needed, depending on the size of the red tiles.

How many pages of red tiles are needed for a square roof needs to be measured according to the selected size. According to the national standard Clay Brick (GB 1 170-89), there are three types of flat tiles, I, II and III, each with a size of 400mm×240mm, 380m×225mm and 360mm×220mm respectively.

The roof with a length of 12.5m and a width of 8.6m is12, 5x8,6 =107,5m2.

If a tile is 0,4x0,24 equals 0,096 square meters,107,5 square meters divided by 0,096 equals 1 120 tile.

If a tile is 0,38x0,225 equals 0,0855 square meters, then 107 and 5 square meters divided by 0 and 0855 equals 1257 tiles.

If a tile is 36x0, 22 equals 0,0792 square meters, 107, and 5 square meters divided by 0,0792 equals 1357 tiles.