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I Have already in the fourth Chapter of this Book, and the second Section thereof, ap∣plyed Geometry to the finding out of the Su∣perficial Content of all Regular Superficies. I have also in the ninth Chapter, and the third Section thereof, shewed how the Superficial Content of any Irregular Superficies may be found, by redu∣cing
them into Regular Forms: which I have explained amply in that Section, I shall there∣fore here be as plain and brief as is possible.
In Measuring of Board, Glass, &c. Carpen∣ters and other Mechanicks measure by the Foot, 12 Inches unto the Foot; so that a Foot of Board, or Glass, contains 144 Square Inches.
Now if a Piece of Board, Plank, or Glass, be required to be measured, let it be either a Parallelogram, or Tapering Piece: first by the Rules aforegoing find the Content thereof in Inches, and that Product divide by 144, the Quotient is the Content of that Superficies in Feet.
In Tiling, Flooring, Roofing, and Partitioning∣work, Carpenters, and other Workmen, reckon by the Square, which is 10 Feet every way; so that a Square containeth 100 Feet: Exam∣ple.
There is a Roof 14 Feet broad, what length thereof shall make a Square? Divide 100 by 14, it yields 7 1/7 Feet.
Now if you have any Number of Feet gi∣ven, and the Number of Squares therein contai∣ned are required, divide that Number by 100, the product is Squares.
In Paving, Plaistering, Wainscotting, and Painting-work, Mechanicks reckon by the Yard Square, so each Yard is equal unto 9 Square Feet.
By the Rules aforegoing find the Superficial Content of the Court, Alley, &c. in Feet: which divide by 9, the Quotient is the Number of Yards in that work contained.