Euclid — "A surface is that which has length and breadth only."
A surface is that which has length and breadth only.
A surface is that which has length and breadth only.
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"What has been affirmed without proof can also be denied without proof."
"If a straight line be cut into two equal parts and also into two unequal parts, the rectangle contained by the unequal parts together with the square on the line between the points of section is equal…"
"A circle is a plane figure contained by one line such that all the straight lines falling upon it from one point among those lying within the figure are equal to one another."
"The extremities of a line are points."
"A prime number is that which is measured by a unit alone."
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