# Stereometric problem

### Stereometric problem

We have a given rectangular parallelepiped$$ABCDA_1B_1C_1D_1$$ with edges $$AB = 6$$, $$BC = 3$$ and $$AA_1 = 6$$. Through the diagonal $$AC_1$$ is passing a plain, which intersects the surrounding edges $$BB_1$$ and $$DD_1$$ in the points K and L respectively. Find the section BK in the case when the area of the cut $$AKC_1L$$ is minimal.

kate

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### Re: Stereometric problem

What are the best stereometric test ? and what are it's main topics ?
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