Beman, Wooster Woodruff, 1850-1922, Smith, David Eugene, 1860-1944 · Boston, Ginn & company · leaf 293
ines of intersection ? What, inthe case of a trihedral angle ? 588. Does the magnitude of a polyhedral angle depend upon thelengths of the edges ? « 589. Construct from stiff paper two symmetric trihedral angles, withface angles of about 30°, 60°, 45°, and see if they are congruent. (Noproof… … Given V-ABCD, any polyhedral angle, and V-ABCD, its opposite polyhedral angle. To prove that V-ABCD and V-ABCD are symmetric.Proof. 1. Z.AVB = AAVB, ZBVC = ZB VC, Prel. prop. VI 2. Dihedral A with edges VB, VB, being formed bythe same planes, have equal (vertical) measuringangles. Prel. prop. VI 3.…
Geometry
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