Haswell's engineers' and mechanics' pocket-book .. (1844)
Haswell, Chas. H. (Charles Haynes), 1809-1907 · New York, Harper & brothers · leaf 67
To find the Area of a four-sided Figure, v)hether it be a Square, Paral-lelogram, Rhombus, or a Rhomboid.Rule.—Multiply the length by the breadth or perpendicular height,and the product will be the area. OF TRIANGLES. To find the Area of a Triangle^figs. 5 and 6, r c 6. … Rule.—Multiply the base a b hy the perpendicular height c d^and half the product will be the area. To find the Area of a Triangle by the length of its sides.Rule.—From half the sum of the three sides subtract each sideseparately ; then multiply the half sum and the three remainderscontinually…
Engineering · Mechanical engineering
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