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Topic: A tough geometry puzzle
Replies: 4   Last Post: Nov 11, 2010 9:58 AM

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Dan Cass

Posts: 442
Registered: 12/6/04
Re: A tough geometry puzzle
Posted: Nov 5, 2010 8:39 AM
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> In quadrilateral ABCD, AB,BC,CD and AD are sides
> whereas
> BD and AC are diagonals .BD and AC intersect at P
> such that BC=AP.Angle BAC=20 degree and AB=AC.Angle
> CAD=
> 140 degree.Find angle ADC.

A careful sketchpad drawing reveals that the ray from B
through P does not meet the ray from A at the angle
140 degrees from the ray AC.

In other words, unless I'm mistaken, the data
are not consistent...

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