A clear vision

A circle containing a regular pentagon and two equilateral triangles. All shown points are on the circle. What’s the angle α?

Scroll down for a solution to this problem.


The angle α is 18°.

Solution by Rony Sarker.

Note this is basically the same problem as Eye of the beholder.


A clear vision
The canopy suspended
Like a rail
Interlacing of loose knots
Of light knots
And fine, protective structure
When it rains
Steel and Iron holding together
Enhancing the skylight
Combining charm with a true
Timeless vision


🤞 Don’t miss these puzzles!

Subscribe to the weekly geometry puzzle e-mail.

Leave a Reply

Your email address will not be published. Required fields are marked *

Optionally add an image (JPEG only)