# Calculate area of hollow cylinder

## ( Equivalent to: surface area of hollow cylinder )

In next fields, kindly type the dimensions of your shape in the text box under title [ Unknowns: ]. After you type your value, click "CALCULATE" button; the answer will be automatically calculated and displayed in the text box under title [ Answer: ]. Also, you will be able to animate your shape through buttons under the below figure.

## How to Calculate Area Of Hollow Cylinder

### Example: What is the area of hollow cylinder with outer-radius = 25 units, inner-radius = 20 units and altitude = 30 units?

As;

By substituting the above given data in the previous function;

(i.e.) = 2*π*((25)2-(20)2)+2*π*(25+20)*30

### Practice Question: Calculate area of hollow cylinder for the following problems:

N.B.: After working out the answer of each of the next questions, click adjacent button of see the correct answer.

( i ) outer-radius = 25 units, inner-radius = 21 units and altitude = 39 units

( ii ) outer-radius = 28 units, inner-radius = 20 units and altitude = 35 units

( iii ) outer-radius = 25 units, inner-radius = 23 units and altitude = 47 units

References