Isosceles triangle 20-80-80

The famous Langley problem is a type of problem called "Adventitious Angles" problem because it is a matter of chance that we will be able to solve this problem. It appears to be an easy problem, but it is deceivingly difficult. Level: High School, SAT Prep, College geometry.

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## Saturday, November 8, 2008

### Langley s Problem, 'Adventitious Angles'

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So what is the name?

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