Firstly notice, as Heath points out in, that Democritus has the idea of a solid being the sum of infinitely many parallel planes and he may have used this idea to find the volumes of the cone and pyramid as reported by Archimedes .
Una paunawa, bilang Heath points out in, na Democritus ay ang mga ideya ng isang solid na ang kabuuan ng walang hanggan maraming mga kahanay ng eroplano at siya ay maaaring magkaroon ng ideya na ginagamit ito upang hanapin ang volume ng apa at tumaas na iniulat ng Archimedes.