. Agricultural engineering; a text book for students of secondary schools of agriculture, colleges offering a general course in the subject and the general reader. Agricultural engineering. CHAPTER V COMPUTING AREAS Method of Computing Areas. One of the primary objects in making a farm survey is the determination of the areas of fields and plats. The computation of areas as here described is dependent upon a knowledge of mensuration and geometry. The general plan to be followed is to divide the tract into simple or primary figures whose areas can be easily calcu- lated. These familiar rules of
. Agricultural engineering; a text book for students of secondary schools of agriculture, colleges offering a general course in the subject and the general reader. Agricultural engineering. CHAPTER V COMPUTING AREAS Method of Computing Areas. One of the primary objects in making a farm survey is the determination of the areas of fields and plats. The computation of areas as here described is dependent upon a knowledge of mensuration and geometry. The general plan to be followed is to divide the tract into simple or primary figures whose areas can be easily calcu- lated. These familiar rules of mensuration will now be reviewed. Rectangles. If a tract of land is rectangular in shape, its area is found by multiplying its length by its breadth. Triangles. If a piece of ground is in the form of a tri- angle, its area may be obtained by either of the following rules: (1) If the length of one side, and the perpendicular distance from this side to the opposite angle, or the altitude of the triangle, are known, the area is one-half the product of the known side as the base, times the altitude. (2) If all three sides of a triangle are measured, then the area may be obtained by adding the lengths of the three sides and dividing the sum by two; from Fig. i6. this half sum subtract the length of each side in turn; multiply together this half sum and the three remainders; the square root of the product equals the desired area. Thus, if a, b, and c are three sides of a triangle, , a + b+c ., and s = , then. S >> area = 1/ s (s-a) (s-b) (s-c) - 4/-/ K ti 6±*<*. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Davidson, Jay Brownlee, 1880-1957. St. Paul, Minn. , Webb Pub. Co.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagricul, bookyear1919
