“The centre of gravity of any cylinder is the point of bisection of the axis.”
Proposition presumed from previous work.
The Method of Mechanical Theorems
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Archimedes 20
Greek mathematician, physicist, engineer, inventor, and ast… -287–-212 BCRelated quotes

“The centre of gravity of a parallelogram is the point of intersection of its diagonals.”
Book 1, Proposition 10.
On the Equilibrium of Planes

"Legal Fiction", line 9; cited from John Haffenden (ed.) The Complete Poems (London: Allen Lane, 2000) p. 37.
The Complete Poems

p, 125
On the Sizes and Distances of the Sun and the Moon (c. 250 BC)