侧面积是指：1、立体图形的侧面展开图的面积(以区别于底面积)；2、物体的侧表面或围成的图形表面的大小，叫作它们的侧面积。涉及侧面积的几何图形包括直柱体和棱柱。
掌握圆柱的侧面积的计算方法，并能具体应用。
Learn the way to calculate the flank area of cylinder and be able to use it well.
以任意五面体为例，介绍了危石侧面积、体积的计算方法。
A method is also presented for calculating the side area and volume of critical rocks with arbitrary pentahedron as example.
对于扩颈桩，由于扩颈处桩周侧面积增大而使切向冻胀力增大对桩产生不利影响。
As for the pile with the expanding neck, the tangent stress grows due to the increased area around the pile's side, which is detrimental to the pile body.
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