Hart, C. A. (Clara Avis), b. 1863, Feldman, Daniel D., b. 1872 · New York, American Book Co · leaf 83
72 PLANE GEOMETRY 195. Cor. VI. Tivo lines perpendicular respectively totwo intersecting lines also intersect. Given two intersecting lines AB Aand CD, and BE ± AB, CF ± CD, To prove that BE and CF alsointersect. 1.2. 3.4.5. 6. Argument Only Draw CB,Z.FCD is a rt. Z. .-. Zl < a rt. Z. Likewise… … Q.E.D. 196. Def. Two or more lines are said to be concurrent ifthey intersect at a common point. Ex. 197. If two parallels are cut by a transversal so that one of theangles formed is 45°, how many degrees are there in each of the otherseven angles ? Ex. 198. If a quadrilateral has two of its sides…
Geometry, Plane · Geometry, Solid
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