A company is making cylindrical cans to hold a product. Each can must contain a fixed capacité V of the product. Assuming the cans are always filled completely with the product, what are the élévation of the can, in terms of V, with extremum surface area? Google's Knowledge Graph is https://ebiz-directory.com/listings262947/une-arme-secr%C3%A8te-pour-marketing-de-contenu