A steel pipe in the shape of a right circular cylinder is used for drainage under a road. The length of the pipe is 12 ft and its diameter is 36 inches. The pipe is open at both ends.
How many square feet of steel is the outer surface of the pipe?

Round to the nearest integer.

the surface area is 124cm²

step-by-step explanation:

length: 4cm

width: 9cm

height:   2cm

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

where:

r: it's the radio

h: it's the height

we have as data that:

substituting:

so, the cylinder volume is

option d

4 inches will get you 10.16 centimeters, but you can either do 10.1 or round up to 10.2. good luck and hope this : )