Figure 4-8.-Geometric sections of a cross section.Figure 4-9.-Area of a square and rectangle.To compute the area of acrosssection, you must first break it down intogeometric figures (squares, triangles,etc.). (See fig. 4-8.) Compute each areaseparately, then total the results toobtain the total squarefeet.To computethe square feet area of a SQUARE orRECTANGLE (fig. 4.9), use the followingequation:Area = Base × Height or (A = B × H).(See fig. 4-9.)Since a RIGHT TRIANGLE is a squareor rectangle cut in half diagonally, thesame equation can be used to compute thearea and the result divided by 2 (fig. 4-10). For example;Another geometric figure you mayencounter in a cross section is aTRAPEZOID (fig. 4-11). The equation tocompute the area of a trapezoid is asfollows:The next step is to compute the total areain the cross section (fig. 4-12). This isaccomplished by adding the results of eachgeometric figure in the cross section. This valueis the total end area of the cross-sectional view.To compute the amount of cubic yards betweentwo cross sections, use the following equation:4-8
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