https://tex.z-dn.net/?f=Aire+%3D+14%2C7+%5E%7B2%7D+-+70+%5Ctimes+14%2C7+%2B+1081%5C%5C%5Cboxed%7BAire+%3D+268%2C09+cm%5E%7B2%7D%7D++