Surface area
= Surface area
The surface area of a measurable region $U\subseteq S$ is $\int_UdA$. For a parametrization $X(u,v)$ it is $\int|X_u\times X_v|\,du\,dv$.
= Surface area
The surface area of a measurable region $U\subseteq S$ is $\int_UdA$. For a parametrization $X(u,v)$ it is $\int|X_u\times X_v|\,du\,dv$.