Primary colours

An equilateral triangle inside a rectangle. What is red : yellow : blue?

Scroll down for a solution to this problem.


Red : yellow : blue is 3 : 5 : 8.

Solution to more general case using Cartesian coordinates

Note the nice corollary A + C = B.

🤞 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Your email address will not be published.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)