Long description: block6fig2
Alt text: A diagram shows two vectors, \(\vec{a}\) and \(\vec{r}\), originating from a point labeled \(O\) and pointing towards a plane containing points \(A\) and \(P\).
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- The image displays a flat, shaded plane oriented diagonally across the view.
- Three labeled points, \(O\), \(A\), and \(P\), are visible in relation to this plane.
- At point \(O\), two vectors are drawn: \(\vec{a}\) points to point \(A\), and \(\vec{r}\) points to point \(P\).
- The vector \(\vec{a}\) is shown to be perpendicular to the plane at point \(A\), as indicated by a small right-angle symbol between the vector and the plane.
- The vector \(\vec{r}\) is drawn from point \(O\) to point \(P\) on the plane.
- A vector labeled \(\vec{n}\) is drawn perpendicular to the plane, passing through point \(A\), suggesting a normal vector to the plane.