(Geodesia 9)
Let us then use a parallelogram-shaped and oblong construction or reservoir similar in form, for example, to the cistern of Aetius, to make clear the measurement of the solid. It is rather easier with that of Aspar because of the equal dimensions of its base, the figure being a plinth ... Let the base then be assumed as the length of the cistern of Apar, 70 orgyai. I seek then to find how many keramia of liquid it is capable of holding. Multiplying the 70 of the length by the same 70 of the width, I have the plane on the base as 4,900 orgyai. These then in turn I multiply by the 12 of the height and there are 58,800 ...
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