Hart, C. A. (Clara Avis), b. 1863, Feldman, Daniel D., b. 1872 · New York, American Book Co · leaf 327
r. IV. If two angles, not in the same plane,have their sides parallel respectively, their planes areparallel. Ex. 1173. Hold a pointer parallel to the blackboard. Is its shadowon the blackboard parallel to the pointer ? why ? Ex. 1174. Find the locus of all straight lines passing through a… … Given II lines AB and CD, and plane MN containing CZ>.To prove plane MN II AB, Argument 1. Either plane MN is II AB or it is not. 2. Suppose M2^ is not II AB; then plane MN will intersect AB. 3. Then plane 3/iYmust also intersect CD, 4. This is impossible, for MN contains CD.6. .-. plane 3AY II…
Geometry, Plane · Geometry, Solid
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