Euclid — "The extremities of a surface are lines."
The extremities of a surface are lines.
The extremities of a surface are lines.
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"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…"
"If a straight line fall on two parallel straight lines, it makes the alternate angles equal to one another, the exterior angle equal to the interior and opposite angle, and the interior angles on the …"
"An obtuse angle is an angle greater than a right angle."
"To apply a given parallelogram to a given straight line in a given rectilinear angle."
"A line is breadthless length."
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