Having constructed the figure, you will find the perpendiculars of the trapezium ACDE 354 and 195; of DFGE = 404 and 340; of DLHF = 426 and 316; and the perpendicular of the triangle FHM = 227 links. Hence the area of the field is = 10a. 2r. 25p.

6. Required the plan and area of a field from the following dimensions.

B

E

C

F

G

NOTE. The preceding figure represents the chain-line, forming the two trapeziums and the triangle, in the 6th Example.-When the learner constructs the figure, he must of course lay down the offsets from the notes, and dot all the chain-lines as before directed.

Answer.

Having constructed the figure, you will find the perpendiculars of the trapezium ABCD, falling upon the diagonal CA, to measure 862 and 314 links; the perpendicular of the triangle DGC, falling upon the diagonal CG, to measure 184 links; and the perpendiculars of the trapezium CEFG, falling upon the diagonal GE, to measure 513 and 300 links.