Mathematical Donuts 🍩

Mathematical Donuts 🍩

Share this post

Mathematical Donuts 🍩
Mathematical Donuts 🍩
What’s the Height of the Red Bar?

What’s the Height of the Red Bar?

A Brain Teaser From Maths StackExchange

Barry Leung's avatar
Barry Leung
Aug 23, 2023
∙ Paid

Share this post

Mathematical Donuts 🍩
Mathematical Donuts 🍩
What’s the Height of the Red Bar?
Share

Today’s Challenge

This is a very interesting problem I found on Maths StackExhange.

Think of how a light source would travel to find the answer.

Give this problem a try before jumping in for the solution!

Keep reading with a 7-day free trial

Subscribe to Mathematical Donuts 🍩 to keep reading this post and get 7 days of free access to the full post archives.

Already a paid subscriber? Sign in
© 2025 Barry Leung
Privacy ∙ Terms ∙ Collection notice
Start writingGet the app
Substack is the home for great culture

Share