Thursday, December 24, 2009

Problem 407. Circle, Angle, Tangent, Perpendicular, Secant, Radius, Center

Proposed Problem
Click the figure below to see the complete problem 407 about Circle, Angle, Tangent, Perpendicular, Secant, Radius, Center.

Problem 407. Circle, Angle, Tangent, Perpendicular, Secant, Radius, Center.
See also:
Complete Problem 407
Level: High School, SAT Prep, College geometry

1 comment:

  1. join D to O, D to E

    => ang DEG = DHA = x ( same arc DF )
    ang DEG = EDO = x ( internal ang , DO // GC )
    ang EDO = OED = x ( OD = OE = radius)
    => ang OEG = 2x = 40

    => x = 20

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