Tangent plane and normal line to a surface – GeoGebra
https://www.geogebra.org/m/wTh7KKd3This applet illustrates the computation of the normal line and the tangent plane to a surface at a point .. Select the point where to compute the normal line and the tangent plane to the graph of using the sliders.; Check the box Normal line to plot the normal line to the graph of at the point , and to show its equation.; Check the box Tangent plane to plot the tangent plane to the graph of …
math - How do I calculate the normal vector of a line ...
https://stackoverflow.com/questions/124361406.08.2009 · The normal vector (x',y') is perpendicular to the line connecting (x1,y1) and (x2,y2). This line has direction (x2-x1,y2-y1), or (dx,dy). So, (x',y'). (dx,dy) = 0 x'.dx + y'.dy = 0 The are plenty of pairs (x',y') that satisfy the above equation. But the best pair that ALWAYS satisfies is either (dy,-dx) or (-dy,dx) Share Improve this answer