Friday, January 2, 2009

Elearn Geometry Problem 215: Quadrilateral, Angle Bisectors, Cyclic Quadrilateral

 Geometry Problem 215: Quadrilateral, Angle Bisectors, Cyclic Quadrilateral.

See complete Problem 215 at:
gogeometry.com/problem/p215_quadrilateral_angle_bisector_cyclic.htm

Level: High School, SAT Prep, College geometry

2 comments:

  1. angle E + angle G
    = 180 - 0.5(angle B + angle C) + 180-0.5(angle A+angle D)
    = 360 - 0.5(angle A + angle B + angle C + angle D)
    = 360 - 180 = 180 #

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  2. angle GFB=A/2 + B/2
    angle GHC=C/2 + D/2
    => GFB + GHC = 180
    => GFE + GHE = 180

    ReplyDelete