In any triangle, if one of the sides be produced, the exterior angle is equal to the two interior and opposite angles, and the three interior angles of the triangle are equal to two right angles.
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"A quantity is said to be a part of a quantity, the less of the greater, when it measures the greater."
"To bisect a given rectilinear angle."
"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."
"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…"
"Parallelograms which are on the same base and in the same parallels are equal to one another."
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