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Euclid's Elements - Book 1, Proposition 15
Euclid's Elements: Book 1, Prop 15
Euclid's Proposition 15: Vertical Angles Equal
Euclid's Elements — Book I, Proposition 15
Euclid's Book 1 - Proposition 15
Euclid Elements -- Proposition 1.15
The Elements : Book 1 Proposition 15.
Proposition 15 - Book 1 - Euclides
Euclid's Elements Book 1 Proposition 15
Euclid Elements -- Proposition 1.5
Proposition 15
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Last Updated: October 26, 2026
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Summary
If two lines cross, the vertical angles are equal. patreon.com/Mathoma Heath's translation of Opposite angles are equal in intersecting lines. If enjoyed, please , share, or . You can also make Vertically opposite angles are defined in the prologue (the derivation of the 5 requirements). Link to applet used in video: ... The base angles of isosceles triangles are equal. The converse is also true. If enjoyed, please , share, or . You can ...