First of all, let's figure out how many faces need to be pasted on a swimming pool like this. A long one has six faces, and the top face of the swimming pool doesn't need to be pasted. So there are only five sides.

This swimming pool is 50 meters long, 50/2 = 25 meters wide and 2.5 meters high. ..

1, bottom area = length * width 50*25= 1250.

2. The area of two relatively long sides = length * height 2*50*2.5=*-2* 125=250.

3. Two smaller lateral area = width * height 2*25*2.5= 125.

So this swimming pool needs:1250+250+125 =1625 square meters of tiles.