Answer : The lateral area of cylinder is, 
Step-by-step explanation :
Formula used to calculate the lateral area of cylinder is:
Lateral area of cylinder = 
where,
r = radius of cylinder = 5 in
h = height of cylinder = 9 in
Now put all the given values in the above formula, we get:
Lateral area of cylinder = 
Lateral area of cylinder = 
Therefore, the lateral area of cylinder is, 