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在“定积分的应用”这一章中讨论到平面图形的面积时指出: 由两条连续曲线y_1=f_1(x),y_2=f_2(x)及直线x=a,x=b(a<6)所围成的平面图形(图1),它的面积计算公式是:
In the section “Application of definite integrals”, when discussing the area of a planar figure, it is pointed out that: From two continuous curves y_1=f_1(x), y_2=f_2(x) and the straight line x=a, x=b(a< 6) The plane pattern enclosed (Figure 1), its area calculation formula is: