Hart, C. A. (Clara Avis), b. 1863, Feldman, Daniel D., b. 1872 · New York, American Book Co · leaf 88
a perpendicular is drawn from thevertex of the right angle to the hypotenuse, the right angle is dividedinto two angles which are equal respectively to the acute angles of thetriangle. Ex. 220. If from the end of the bisector of the vertex angle of anisoscele.s triangle a jierpendicular is dropped… … 3. Z1=Z^ 4.5. Given A ABC, To prove /.A + A ABC + Z (7 = 2 rt. A, Argument Reasons 1. Through B draw DE II AC. 1. Parallel line post. § 179. 2. Z 1 + Z ABC + Z 2 2. The sum of all the A about= 2 rt. Zb a point on one side of a str. line passing throughthat point = 2 rt. A, %m, 3. Alt. int. A of II…
Geometry, Plane · Geometry, Solid
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