Proof
Reproduce each face-angle by I.23 in the appropriate planes; by XI.23
the resulting figure determines a solid angle congruent to the given
one.
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Depends on (3)
- I.23Proposition I.23On a given straight line and at a point on it to construct a rectilineal angle equal to a given rectilineal angle.
- XI.10Proposition XI.10If two straight lines meeting one another be parallel to two straight lines meeting one another, not in the same plane,…
- XI.23Proposition XI.23To construct a solid angle out of three plane angles, two of which, taken together in any manner, are greater than the…
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