# How do you find the area of the top and lateral surface of a cylindrical water tank with radius 20 ft and height 30 ft.?

##### 1 Answer

Nov 12, 2016

#### Answer:

Exact value

Approx value

#### Explanation:

Interesting that the bottom is not required in the solution.

Assumption: The top is not curved but flat.

Let the unit of measurement be

Area of top

.........................................................................

Lateral area

.............................................................................................

It is more precise to calculate the sum in this way: