Euclid — "A straight line is that which lies evenly between its extreme points."
A straight line is that which lies evenly between its extreme points.
A straight line is that which lies evenly between its extreme points.
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"Proof by contradiction is a powerful tool."
"In isosceles triangles the angles at the base are equal to one another, and, if the equal straight lines be produced further, the angles under the base will be equal to one another."
"A plane surface is a surface which lies evenly with the straight lines on itself."
"If a straight line be drawn from the ends of a straight line, it will be a triangle."
"A prime number is that which is measured by a unit alone."
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