L = ∮ p n ⋅ k d S , displaystyle L=oint pmathbf n cdot mathbf k ;mathrm d S, D p = ∮ p n ⋅ i d S , Y = ∮ p n ⋅ j d S . displaystyle start off aligned D_ p &=oint pmathbf n https://garage-ceiling-storage-li87531.yourkwikimage.com/1289809/garage_ceiling_storage_lift_can_be_fun_for_anyone