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在三维空间的任一平面内,平面几何的公理和定理仍然成立。因此,在解证立体几何问题时,不忘灵活运用平面几何的定理是十分重要的,也是十分有益的。下面以一道散见于各
In any plane of a three-dimensional space, the axioms and theorems of plane geometry still hold. Therefore, it is very important to use the theorem of plane geometry to solve the problem of solid geometry. It is also very useful. The following are scattered in each