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Trapeziums are Quadrangles of sundry forms: yet take this as a general Rule, whereby their Content may be found. Admit it be required to find the Area or superficial Content of the Tra∣pezium ABCD, to find which, first by drawing
the Diagonal AD, you reduceth it into two Tri∣angles, ABD, and ADC. Then by prop. 3. §. 1. of Chap. 4 let fall the two Perpendiculars on AD, from B, and C, Then by prop 3. §. 2 Ch.* 1.1 4. find the superficial Content of the two Trian∣angles ABD, and ADC, which added together, is the Content os the Trapezium; by which Rule the Content of the Trapezium, A, B, C, D, is found to be 630 Perches.
Fig. 59.