Friday, August 20, 2010

Problem 507: Triangle, Interior Point, 120 Degrees, Congruence, Angle

Geometry Problem
Click the figure below to see the complete problem 507 about Triangle, Interior Point, 120 Degrees, Congruence, Angle.

Problem 507. Triangle, Interior Point, 120 Degrees, Congruence, Angle


See also:
Complete Problem 507

Level: High School, SAT Prep, College geometry

4 comments:

  1. Draw CG = AC, G on extension of AD
    => ▲DGC isoceles, => ▲BGD equilateral
    => B, D, C are on circle with center G
    => x = 1/2 arc BD, BGD = arc BD, => x = 1/2 BGD
    => x = 30°

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  2. [URL=http://img844.imageshack.us/i/p507triangleangle.gif/][IMG]http://img844.imageshack.us/img844/5466/p507triangleangle.th.gif[/IMG][/URL]

    Uploaded with [URL=http://imageshack.us]ImageShack.us[/URL]

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