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.

• Reference: The Mathematical Gazette, UK

• Author: Edward M. Langley

• Title: A problem

• Page: 173

• Issue: October 1922

• Category: M Note 644