Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 224
half the perimeter of the figure by the perpendicularLei fall from the centre on one of the sides, and *lte product willhe the area (Bk. IV. Th. xxvi) OP GEOMETRY. 223 Mensuration of Surfaces. EXAMPLES. 1. Required the area of the regularpentagon ABCDE, each of whose -®1sides AB, BC, &c, is 25… … 25x5 : 62.5 = half the perim- eter. Then, 625x17.2 = 1075 sq. /*.=the area. 2. The side of a regular pentagon is 20 yards, and the per-pendicular from the centre on one of the sides 13,76382 ; re-quired the area. Ans. 688.191 sq. yds. 3. The side of a regular hexagon is 14, and the perpen-dicular…
Geometry · Plane trigonometry
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