Le_Forgeron <jgr### [at] freefr> wrote:
> > Note that in the spirit of the puzzle, a prism would do... if only you

>

> That does not make it easier.

If a certain minimum of beauty is *not* a prerequisite, then I have something:
Make a prism of this...

The "ears" are constructed with the same radius as the "body" of the shape; the
triangular cutout at the bottom left must have a height of R*(7*sqrt(3/4)-6)
(which *can* be done with compass & straightline).

The fact that the total area of this shape is 7*R^2*pi/6 should be evident... ;)

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