# Why is flatness a problem is cosmology?

The Universe appears to have a value of $\Omega$ very close to $1$. This means the internal angles of a triangle add to ${180}^{\circ}$ which is very odd, because it is far more likely that there will be an excess of mass-energy in the Universe (meaning $\Omega$ would be greater than $1$ and the internal angles $< {180}^{\circ}$) or too low an energy density, meaning $\Omega < 1$ and the internal angles $> {180}^{\circ}$.
It's just weird that it is so very close to $1$, with no a priori reason for it having this value. Cosmologists, feeling honest, accept it's a bit embarrassing.