Simple Problem

Geometry Level pending

Is 1+2+3+4+5+4+3+2+1=9+7+5+3+1? true? how about 1+2+3...+142379+142379+142378.....3+2+1=284757+284756+284755....+2+1 It is probably obvious that it is, but what shape proves it very clearly and easily?

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