Euclid — "A plane angle is the inclination to one another of two lines in a plane which me…"
A plane angle is the inclination to one another of two lines in a plane which meet one another and do not lie in a straight line.
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More from Euclid
"Let it be granted that a straight line may be drawn from any one point to any other point."
"If four magnitudes be proportional, the rectangle contained by the extremes is equal to the rectangle contained by the means."
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