To calculate the volume of a cylindrical tank, we need to use the formula:

Volume = π * (radius)^2 * height

Given that the diameter of the tank is 10 meters, we can find the radius by dividing the diameter by 2:

Radius = diameter / 2 = 10 m / 2 = 5 m

Now, we can calculate the volume using the formula:

Volume = π * (5 m)^2 * 15 m

Volume = 3.14 * (5 m)^2 * 15 m

Volume ≈ 3.14 * 25 m^2 * 15 m

Volume ≈ 3.14 * 375 m^3

Volume ≈ 1177.5 m^3

Therefore, the volume of the cylindrical tank is approximately 1177.5 cubic meters