Equal weights at equal distances are in equilibrium and equal weights at unequal distances are not in equilibrium but incline towards the weight which is at the greater distance.

The centre of gravity of any parallelogram lies on the straight line joining the middle points of opposite sides.

The perimeter of the earth is about 3,000,000 stadia and not greater.

Give me a place to stand, and a lever long enough, and I will move the world.

Those who claim to discover everything but produce no proofs of the same may be confuted as having actually pretended to discover the impossible.

Having been the discoverer of many splendid things, he is said to have asked his friends and relations that, after his death, they should place on his tomb a cylinder enclosing a sphere, writing on it the proportion of the containing solid to that which is contained.

Two magnitudes whether commensurable or incommensurable, balance at distances reciprocally proportional to the magnitudes.