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Online Geometry Problem 9. Triangle,Angles, Congruence, 30 Degrees, Auxiliary Lines. Level: High School, Honors Geometry, College, Mathematics Education

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In the figure below, AB = BD = AD, angle ACD = 10, angle CAD = x and angle CBD = x + 30. Find x. Try to use elementary geometry (Euclid's Elements.)

 

Proposed Geometry Problem 09, Triangle, Angles
 

See also:
Sketch problem 9, art 01
Sketch problem 9, art 02

Original problem art 9


 

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Home | SearchGeometry | Problems | All Problems | Open Problems | Visual Index | 10 Problems | Art | 1-10 | Key theoremsEmail | 1-100 | By Antonio Gutierrez

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Last updated: Sep 19, 2014