Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 118
he commonintersection as C, we draw CD in theplane AB, and CE in the plane ECF,and both perpendicular to CF at C,then will the angle DCE measure the inclination betweenthe two planes. It should be remembered that the line £C is directIv ov«ithe line CD. 7. A polyedral angle is the angularspace… … THEOREM I. Two straight lines which intersect each other, lie ni tliv. saw.plane, and determine its position. Let A B and AC be two straight lineswhich intersect each other at A. Through AB conceive a plane to bepft3sed, and iet this plane be turnedaround AB until it embraces the pointC: the plane…
Geometry · Plane trigonometry
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