For the moduli space of the punctured spheres, we find a new equality between
two symplectic forms defined on it. Namely, by treating the elements of this
moduli space as the singular Euclidean metrics on a sphere, we give an
interpretation of the complex hyperbolic form, i.e. the K\"ahler form of the
complex hyperbolic structure on the moduli space, as a kind of Weil-Petersson
form.Comment: 29 pages, all comments are welcome