Euclid — "A plane surface is a surface which lies evenly with the straight lines on itself…"
A plane surface is a surface which lies evenly with the straight lines on itself.
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More from Euclid
"The extremities of a surface are lines."
"An acute angle is an angle less than a right angle."
"Parallel straight lines are straight lines which, being in the same plane and being produced indefinitely in both directions, do not meet one another in either direction."
"To draw a straight line from any point to any point."
"That all right angles are equal to one another."