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Measure that angle III (Posted on 2004-09-07) Difficulty: 4 of 5
Triangle ABC has side AB=AC, and angle BAC = 20 degrees.

D is a point on side AC with AD=BC. Find angle DBC.

Solve this without trigonometry.










See The Solution Submitted by Brian Smith    
Rating: 3.2000 (5 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re(3): Solution by cheating | Comment 14 of 25 |
(In reply to re(2): Solution by cheating by Ken Haley)

Exactly, I didn't prove that... that's where I cheated.  If you look at a problem called "Measure That Angle" (no II or III) you'll see that for a 20 degree isosceles triangle, you will have AD = DE = EB = BC.

I didn't prove it, I cheated and used prior knowledge.


  Posted by nikki on 2004-09-09 08:26:03
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