The folded napkin

A square sheet of paper is folded symmetrically from a corner. If the fold length is 4, what is the area of the triangle formed by the other three corners?

Scroll down for a solution to this problem.


The triangle area is √3.

Solution by Ignacio Larrosa Cañestro.


Green paper napkin
Like flowers in Japan
A nice origami design
Folded as a sun catcher
It can be a fortuneteller
You can take it as a protection
Or write on your reflexions
Just play with as a kite
up in the air
Sail up there the breeze and go
Whichever it chanced to blow


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