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 Problem 8. Triangle,  Angles, 90 Degrees, Congruence. Level: High School, SAT Prep, College geometry

In the figure, AB = BC = AD, angle B = 90º, angle CAD = x and angle ACD = 45º - x. Find x. Post a comment or solution. Try to use elementary geometry (Euclid's Elements.)
 

Geometry Problem: Congruence
 


Hints:
 Key theorems
 Triangle congruence

 

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