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>> No.11434854 [View]
File: 179 KB, 843x580, pic-selected-200302-2136-57.png [View same] [iqdb] [saucenao] [google]
11434854

I don't understand how the force P is obtained in pic related. I know that (1/2)*18*1 is the area of the triangle, but where does the 1 come from? And then why does it multiply by 18 again?

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