OU blog

Personal Blogs

Richard Walker

A Quick Geometric Problem

Visible to anyone in the world

Michael Penn put this up on his YouTube channel earlier today, and it is indeed an elegant little problem. Here it is

Michael Penn solves this using congruent triangles, the angle sum of a triangle (180 °) and angles on a straight line (180 °). α is always 60 °, whatever the length of AD and CE. It's not that obvious and I was quite surprised.

However thinking about it later, I saw we can solve the problem using symmetry and the solution is super-nice. Here's how - just add a third line.

Permalink Add your comment
Share post