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Good.

The problem here is that active voice is used in English and passive voice should be used here in Russian. So, it is, "Днище наклонено (скошено) по отношению к..." But if you say, "Днище наклонено...

I suspect that "corner" here is not "угол" but some more specific technical term. Like "ребро", "угловой шов" or something of the kind.

I'd say, "Дно бака наклонено по отношению к..." (whatever...