Hart, C. A. (Clara Avis), b. 1863, Feldman, Daniel D., b. 1872 · New York, American Book Co · leaf 333
as revolved about a line com-mon to the two. Thus in the figure we may imagine face CBfirst to have been in the position of face AB and then to haverevolved about jBC as an axis to the position of face CD. 670. Def. The plane angle of a dihedral angle is the angleformed by two straight lines, one… … A Ex. 1188. All plane angles of a dihedral angle are equal. Ex. 1189. Is the plane of angle EFH (§ 667) perpendicular to theedge BC? Prove. State your result in the form of a theorem. Ex. 1190. Is Ex. .309 true if the (}uadrilateral is a quadrilateral inspace, i.e. if the vertices of the…
Geometry, Plane · Geometry, Solid
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