Proposition 5 Any solid lighter than a fluid … will be equal to the weight of the … immersed when the fluid is at rest. As … the same vertex continuous with the former and … the second pyramid to be equal and similar … [BGHC] … Then, since the pressure on the parts of … [across the first and second pyramid] must be equal in order that the fluid may be … equal to the weight of the solid EGHF. …
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