Hart, C. A. (Clara Avis), b. 1863, Feldman, Daniel D., b. 1872 · New York, American Book Co · leaf 335
. 1192. If one plane meets another plane, the sum of the twoadjacent dihedral angles is two right dihedral angles.Hint. See proof of § 65. - Ex. 1193. If the sum of two adjacent dihedral angles is equal to tworight dihedral angles, their exterior faces are coplanar.Hint. See proof of § 76. Ex.…
Geometry, Plane · Geometry, Solid
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