Two parallel squares with four line segments connecting opposing vertices. Prove that they pass through a single point.

Solution

Poem

Le Petit Nicolas
The little schoolboy
One day was born
And was drawn
By the pen of Sempé
A pretty inspired tale
With multiple comics
Sempé was a genious
With his short illustraded texts
But today le Petit Nicolas
Is sad
His dad
Sempé
Left us
He went to draw in the sky

Bella