‹‹‹ Vitr. 4.8.2 | Table of Contents | Vitr. 4.8.4 ›››
3In the centre of the roof, the height of it is equal to half the diameter of the work, exclusive of the flower. The flower without the pyramid is to equal in dimensions the capitals of the columns. The other parts are to be similar in proportions and symmetry to those already described.
3The proportions of the roof in the centre should be such that the height of the rotunda, excluding the finial, is equivalent to one half the diameter of the whole work. The finial, excluding its pyramidal base, should have the dimensions of the capital of a column. All the rest must be built in the symmetrical proportions described above.