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?

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## Solution

The triangle area is √3.

## Poem

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