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CTS Library / The Thirteen Books of Euclid's Elements

The Thirteen Books of Euclid's Elements (1.def.11-1.def.15)

urn:cts:greekLit:tlg1799.tlg001.perseus-eng2:1.def.11-1.def.15
Refs {'start': {'reference': '1.def.11', 'human_reference': 'Book 1 Type def Number 11'}, 'end': {'reference': '1.def.15', 'human_reference': 'Book 1 Type def Number 15'}}
Ancestors [{'reference': '1'}, {'reference': '1.def'}]
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11

An obtuse angle is an angle greater than a right angle.

12

An acute angle is an angle less than a right angle.

13

A boundary is that which is an extremity of anything.

14

A figure is that which is contained by any boundary or boundaries.

15

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;

Tokens

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