# The 80-80-20 Triangle Problem, A Variant

The isosceles triangle with the apex angle of 20° and the base angles of 80° is a recurring subject of geometric problems. The most popular is the one where cevians are drawn from the base vertices at angles of 50° and 60°, and the task is to determine one of the so formed angles.

A novel problem has been suggested by Radheyshyam Poddar:

ABC is an isosceles triangle with vertex angle

### Solutions

|Contact| |Front page| |Contents| |Geometry| |Up|

Copyright © 1996-2018 Alexander Bogomolny

71732289