Book 1, Proposition 13.
On the Equilibrium of Planes
“The centre of gravity of any parallelogram lies on the straight line joining the middle points of opposite sides.”
—
Archimedes
,
book
On the Equilibrium of Planes
Book 1, Proposition 9.
On the Equilibrium of Planes
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Archimedes 20
Greek mathematician, physicist, engineer, inventor, and ast… -287–-212 BCRelated quotes
Book 1, Proposition 4.
On the Equilibrium of Planes
Book 1, Proposition 14.
On the Equilibrium of Planes
“The centre of gravity of a parallelogram is the point of intersection of its diagonals.”
Book 1, Proposition 10.
On the Equilibrium of Planes
Proposition 6.
The Method of Mechanical Theorems
Aristarchus of Samos
ancient Greek astronomer and mathematician
p, 125
On the Sizes and Distances of the Sun and the Moon (c. 250 BC)
“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
of the portion adjacent to the base
Proposition presumed from previous work.
The Method of Mechanical Theorems
“A circle is a round straight line with a hole in the middle.”
Mark Twain
(1835–1910) American author and humorist
Quoting a schoolchild in "English as She Is Taught"
As quoted by Bryant, ibid.
Astronomia nova (1609)