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Suppose the figure B were a piece of Land, which being plot∣ted and cast up by a Chain of 16 foot and a halfe to the Perch, should contain 8 Acres, and that it were required to finde how much the
same piece would contain if it were measured with a Chain of 18 foot to the perch: if you work according to the proportion here delivered, you shall finde it to contain 6 Acres 72 parts: for,
If you extend the Compasses from 18 to 16½, that extent will reach from 8 to 7.30, and from 7.30 to 6.72, and so many Acres would the figure B contain if it were measured by a perch of 18 foot.