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在求三棱锥的体积时 ,当棱锥的底面面积或高较难直接求 ,甚至不能求时 ,这就要求我们将三棱锥的底面或高进行变换 ,利用等积变换来求其体积 .利用等积变换求三棱锥的体积时 ,常有如下几种技巧 :图 1(1)1 换顶点 ,换底面例 1 如图 1 (1 )所示 ,正方形ABCD的边长为 1 ,点E ,F是
When calculating the volume of the triangular pyramid, when the area or height of the bottom of the pyramid is difficult to directly find, or even impossible, this requires us to transform the bottom or height of the triangular pyramid, and use the equal product transformation to find its volume. Product transformation to find the volume of the triangular pyramid, there are often the following techniques: Figure 1 (1) 1 change the vertex, change the bottom Example 1 As shown in Figure 1 (1), the square ABCD side length 1, point E, F Yes