Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 118
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… … 118 GEOMETRY. Of Planes. the position of the plane is determinedby the single condition of containingthe two straight lines AB, A C. Cor. 1. A triangle ABC, or threepoints A, B, C, not in a straight line,determine the position of a plane. Cor. 2. Hence, also, two parallelsAB, CD determine the…
Geometry · Plane trigonometry
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