This keyboarded and encoded edition of the work described above is co-owned by the institutions providing financial support to the Early English Books Online Text Creation Partnership. Searching, reading, printing, or downloading EEBO-TCP texts is reserved for the authorized users of these project partner institutions. Permission must be granted for subsequent distribution, in print or electronically, of this text, in whole or in part. Please contact project staff at eebotcp-info@umich.edu for further further information or permissions.
A Trapeziam is any irregular four sided figure of what fashion so∣ever, as the figure ABCD is a Trapeziam, and may be cast into two
line AC, and so each Triangle mea∣sured as is before shewed, which being done, adde the contents of them both together, and you shall have the con∣tent of the whole Trapeziam ABCD. Or you may more readily measure it thus: Take one half the Diagonall line AC, which in this example will be 8 inches, for one side of your piece, and take the two perpendiculars BF and DE, and joyn them both toge∣ther in one sum, so shall you have in this example 10 inches for the other side of your piece, with which two sides, (as if it were an unequall squared piece of Timber) proceed as before, in the former part of the tenth Chapter.