Hart, C. A. (Clara Avis), b. 1863, Feldman, Daniel D., b. 1872 · New York, American Book Co · leaf 322
.^(7=2)^. 11. But BA = ED and BC== EF. 12. .-. A ABC = A DEF. 13. .-. Z ABC= Z D^i^. Q.E.D. 1 2 3 4 5 6 7 8 9 10 11 12 13 Reasons§ 122.§ 54, 15.By hyp.§240.§ 232.§ 54, 1.§ 220.§ C18.§ 240.§ 232.Arg. 1.§ 116.§110. Ex. 1167. Prove Prop. IX if the angles lie on opposite sides of BE* It will ulso be… … Given AB II CD and AB ± plane MN.To prove CD _L plane MN. Argument 1. Through D draw any line in plane MN, as DF, 2. Through B draw BE in plane MN 1! DF. 3. Then Z ABE = Z CZ)i^. 4. But Z ^^^ is a rt. Z..-. Z CDF is a rt. Z; i.e. Ci) ± Di^, any line in plane MN through D,.\ CD ± plane MN. Q-e.d. 5.…
Geometry, Plane · Geometry, Solid
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