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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.)
Best I could do | Comment 8 of 25 |

I made this diagram using geometer's sketchpad

It didn't yield any insights that led me to a proof, but I did find the angle.

It is 70 degrees.

-Jer


  Posted by Jer on 2004-09-08 12:40:50
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