Hart, C. A. (Clara Avis), b. 1863, Feldman, Daniel D., b. 1872 · New York, American Book Co · leaf 102
base, an adjacentangle, and the altitude, making your construction depend upon § 240. Ex. 291. If the perpendiculars to a line from any two points in an-other line are equal, then the lines are parallel. Ex. 292. If two parallelograms have two vertices and a diagonal incommon, the lines joining the… … A D Given quadrilateral ABCD with, its diagonals AG and BD in-tersecting at 0 so that A0= CO and BO = DO.To prove ABCD a O. Argument Only 1. In AOBC and ODA, BO = DO. 2. CO = AO. 3. Z3 = Z4. 4. .-.A OBC=A ODA. 5. .-. BC=AD, 6. Also Zl = Z2. 7. .-. ^Cll AD. 8. .*. ABCD is a O. Q.E.D. Ex. 293. In…
Geometry, Plane · Geometry, Solid
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