Outer area:
= πr²h
= 3.14 × 5 × 5× 4
= 3.14 × 20 × 5
= 314
Inner area:
= πrh
= 3.14 × 2 × 2× 4
= 3.14 × 8 × 2
= 50.24
Area of tank
= outer area - inner area
= 314 - 50.24
= 263.76 ft²
