Atrain travels 82 kilometers in 2 hours, and then 83 kilometers in 2 hours. what is its average speed?

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

i think the answer is c sorry if it's wrong