perplexus.info :: Geometry : Measure that angle III

Measure that angle III (Posted on 2004-09-07)

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)

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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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