The tank has the shape of a cone
So, the area of the cone = π r²+ π r s
where r is the radius
s is the slant height = √(r²+h²)
h is the height
given the diameter = 18 m and the height = 54 m
∴ r = 9 m , h = 54 m
∴ s = √(r²+h²) = √(9² + 54²) = 54.745 m
∴ Area = π r²+ π r s
= π * 9² + π * 9 * 54.745 ≈ 1802.3 m²
The correct answer is the first option 1802 m²