A circle with four chords and a diameter. What’s the proportion blue : green?

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## Solution

Blue : green is 1 : 1.

This problem is widely known as the Butterfly Theorem. A staggering amount of 25 solutions can be found here.

## Poem

Angel wings

Or butterfly theorem

He flies with a high speed dash

It’s an ephemeral life

Between heaven and earth

A flight among the flowers

That brings joy and happiness

Every day is party

Without being worked up

He masters the horizon

With his angel wings

The butterfly

## One reply on “Angel wings”

Angel wings

(Butterfly theorem)