Langley’s Adventitious Angles - Alchetron, the free social encyclopedia
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Langley’s Adventitious Angles - Alchetron, the free social encyclopedia
Langleys Adventitious Angles is a mathematical problem posed by Edward Mann Langley in the Mathematical Gazette in 1922. In its original form the problem was as follows ABC is an isosceles triangle. BC80degrees. CF at 30 degrees to AC cuts AB in F. BE at 20 degrees to AB cuts AC in E. Prove
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