How many yards is in 1 foot deep by 200ft. x 200 ft.?

Answer 1

Assuming by "yard" you mean a "builder's" yard = 1 cubic yard:

1 yd = 3 ft

1 cu yd = 1 yd x 1 yd x 1 yd = 3 ft x 3 ft x 3 ft = 27 cu ft.

1ft x 200 ft x 200 ft = 40000 cu ft

→ 40000 cu ft = 40000 ÷ 27 cu yd = 1481 13/27 cu yd ≈ 1481.5 cu yd.