the average is 0. people usually mean the average of the absolute value.
RMS can be thought of as the "DC equivalent" value of the AC signal.Average/Mean and RMS value of AC signal
Please give general idea about these two mentioned topics
What you have described is the average of the absolute value of the AC signal, not the RMS value.RMS can be thought of as the "DC equivalent" value of the AC signal.
On a graph, it is the "straight-line" value such that the area bounded by it and the X-axis (at the top and bottom) from 0 degrees to 360 degrees is equal to the area bounded by the X-axis and the 2 half-cycles of the sine wave.