Gore, James Howard, 1856-1939 · New York, Longmans, Green, and co. · leaf 167
parallel to each other, or ABB1 A is a parallelo-gram, and hence AB = AB. Therefore the triangles ACB and ACB have their sidesrespectively equal, and hence their angles are equal, orZ C = Z C. 2. Since AA = BB = CO, the two planes are equally dis-tant, and hence parallel. Q.E.D. 354. COR. If two… … Let AB and CD be intersected by the parallel planes MN,PQ, ItS, in the points A, E, B, and C, F, D. AE CF We are to prove EB FD Draw AD, cutting the plane PQ in G.Join the points E, G, and F, G. §359.] DIEDRAL ANGLES. 15.5 In the triangle ABD, EG, being in the plane PQ parallel tojR>Sy, will be…
Geometry
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