Using the formula p = 2(a + b), find a when p = 15 and b = 5.

for this case we have that by definition, the surface area of a cylinder is given by:

where:

r: it is the radius of the cylinder

h: it is the height of the cylinder

we can also rewrite it as:

where:

la: it's the lateral area

ba: area of the base

option a

54/3 is 18 so 18 is your answer