Solid angle
idea · 1 work · 3 mentions · 8 anchored passages
solid angle · a solid angle · angle at A · angle at D · the solid angle
in the texts
Elements
A three-dimensional angular inclination formed by more than two plane angles meeting at a point, not lying in one plane.
and the angle DAB is equal to the angle BAE;
But they are also equal to four right angles:
therefore the angle ABC is equal to the angle LOM.