Fold up all four leaves. You'll find that you have a pyramid with a square base. The length of each side of this base is 2 units.
The height of each of the four triangles, as measured as an altitude, is
h = sqrt(2^2+3^2) = sqrt(4+9) = sqrt(13).
You weren't asked to do these calculations, but rather to name the figure. Again: it's a pyramid with a square base.
