sidebar interaction. Press tab to begin. For each \vec{b} and each subspace W, the vector \vec{b} - m{proj}_W \vec{b} is orthogonal to W Hint: Look at the picture in the slide and imagine the plane is the subspace W. Note that the vector \vec{r} in the figure is equal to \vec{r} = \vec{b} - m{proj}_W \vec{b}