Proposition: Prop. 11.26: Construction of Solid Angle equal to Given Solid Angle
Euclid's Formulation
To construct a solid angle equal to a given solid angle on a given straight line, and at a given point on it.
* Let $AB$ be the given straight line, and $A$ the given point on it, and $D$ the given solid angle, contained by the rectilinear angles $EDC$, $EDF$, and $FDC$.
* So, it is necessary to construct a solid angle equal to the solid angle $D$ on the straight line $AB$, and at the point $A$ on it.
Modern Formulation
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Table of Contents
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Proofs: 1
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References
Adapted from (subject to copyright, with kind permission)
 Fitzpatrick, Richard: Euclid's "Elements of Geometry"
Adapted from CC BYSA 3.0 Sources:
 Prime.mover and others: "Pr∞fWiki", https://proofwiki.org/wiki/Main_Page, 2016