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CTS Library / The Thirteen Books of Euclid's Elements

The Thirteen Books of Euclid's Elements (1.def.6-1.def.10)

urn:cts:greekLit:tlg1799.tlg001.perseus-eng2:1.def.6-1.def.10
Refs {'start': {'reference': '1.def.6', 'human_reference': 'Book 1 Type def Number 6'}, 'end': {'reference': '1.def.10', 'human_reference': 'Book 1 Type def Number 10'}}
Ancestors [{'reference': '1'}, {'reference': '1.def'}]
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6

The extremities of a surface are lines.

7

A plane surface is a surface which lies evenly with the straight lines on itself.

8

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.

9

And when the lines containing the angle are straight, the angle is called rectilineal.

10

When a straight line set up on a straight line makes the adjacent angles equal to one another, each of the equal angles is right, and the straight line standing on the other is called a perpendicular to that on which it stands.

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