Subway: term of Greek origin that means " measured ". The Greek etymology provides affixes which most pristine origins appear in Medo-persas and Aramaic languages:-Metro, is a sequence of equal segments whose units follow a pattern of multiples or submultiples to be separated from the unit first and go to compose other magnitudes of greater or lesser proportion always direct each other; EJS.: the bamboo cane; a train; subplano Cartesian, the urban nomenclature, a keyboard, the score, etc. The word Metro, not only referred to a system of measures, but also to the instrument as a pattern, containing exactly the unit convensionalmente adopted in such a way that, subway tailor, has 150 centimeters, while that of a bricklayer, reaches the 300 cms., or even determines in detail units and fractions in systems not decimals and mixed--square: area which can be divided into thousand frames of a centimeter on each side. Cubic metre: amount that is assumed, can caver in a bucket of 1mt per side.