To compute the square feet area of a SQUARE orRECTANGLE (fig. 15-18), use the followingequation:Area = Base x Height or (A = B x H).Since a RIGHT TRIANGLE is a square orrectangle cut in half diagonally, the same equation canbe used to compute the area and the result divided by2 (fig. 15-19). For example,Another geometric figure you may encounter in across section is a TRAPEZOID (fig. 15-20). Theequation to compute the area of a trapezoid is asfollows:The next step is to compute the total area in thecross section (fig. 15-21). This is accomplished byadding the results of each geometric figure in the crossFigure 15-18.—Area of a square and rectangle.Figure 15-19.—Area of a triangle.15-14
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