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Angle ABC (Posted on 2006-02-25) Difficulty: 3 of 5
In a triangle ABC, D is the midpoint of BC. Join AD. Angle ADB = 45 degree and angle ACB = 30 degree. Find angle ABC.

No Solution Yet Submitted by akash    
Rating: 2.3000 (10 votes)

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No Subject | Comment 4 of 13 |
ABC and DBA are similar, and proving that will give a solution because angle ACB is 30 and angle ADB is 45, so angle ABC must be 105.

The only problem is proving that ABC and DBA are similar, then. I still don't see how to do this, but it should be possible, and perhaps possible without using trig.
  Posted by Richard on 2006-02-25 18:08:42
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