Undecided Question
If the height of a cylinder is h=10, and the radius of the cylinder is r=5, what is its volume?

Answerer 1
look dear what you need
you need a regular rectangular object
fill up your cylinder with pure water
drop it then to the rectangular measuring object
measure the new dimensions and the volume is XxYxZ
simple isnt it?
you trust better exact measures
or approximate derivative measures, tell me?