We use the mechanical model, a protractor. We should measure the number of the lines, and then, we use the measure of the lines to calculate the the angle of degree and the radians.
Plot the flux as a function of radians. The graph showed the flux which was a curve. From the graph, we knew that the flux has relationship with the angle and radians.
The flux equals the dot product of the vectors of electric field and the vector of the area. In other words, the flux equals the electric field multiply the area, and multiply cosine the angle between the electric field and the area.
This picture showed the flux into or out of an oval and electric flux with two charges. From the activity, we knew if the area has flux, the flux must have a charge or more charges inside the flux.
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