"If a number be the least that is measured by any prime numbers, it will not be measured by any other prime number except those originally measuring it."

"To cut off from the greater of two given unequal straight lines a straight line equal to the less."

"Further, of trilateral figures, a right-angled triangle is that which has a right angle, an obtuse-angled triangle that which has an obtuse angle, and an acute-angled triangle that which has its three…"

"A plane surface is a surface which lies evenly with the straight lines on itself."

"Of quadrilateral figures, a square is that which is both equilateral and right-angled; an oblong that which is right-angled but not equilateral; a rhombus that which is equilateral but not right-angle…"