1. On the top right, click on the "rotate" icon between the magnet and the cube to rotate the diagram (you can also change the speed of rotation). 2a. The first three sliders [color=#c51414][b]n_1[/b]x[/color], [color=#0a971e][b]n_1[/b]y[/color] and [color=#1551b5][b]n_1[/b]z[/color] represent the components of [b][color=#1551b5]n_1[/color][/b], the normal vector of the plane [color=#1551b5]Π_1[/color]. 2b. Use the fourth slider to change the value of a_1 in the equation of the plane [color=#1551b5]Π_1: [b]r[/b].[b]n_1[/b] = a_1[/color]. 2c. Click the checkbox to display the normal vector [color=#1551b5][b]n_1[/b][/color]. 3. You can choose to show the planes [color=#c51414]Π_2[/color] and [color=#0a971e]Π_3[/color] as well.