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Definition: Def. 11.05: Inclination of a Straight Line to a Plane

The inclination of a straight line to a plane is the angle contained by the drawn and standing (straight lines), when a perpendicular is lead to the plane from the end of the (standing) straight line raised (out of the plane), and a straight line is (then) joined from the point (so) generated to the end of the (standing) straight line (lying) in the plane.

Modern Formulation

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References

Adapted from (subject to copyright, with kind permission)

1. Fitzpatrick, Richard: Euclid's "Elements of Geometry"

Adapted from CC BY-SA 3.0 Sources:

1. Prime.mover and others: "Pr∞fWiki", https://proofwiki.org/wiki/Main_Page, 2016