Question: color areas between two curves

I hope to plot two functions f1:=x^2 ,f2:=x; and color regions in the 2d plane where f1(x) <  f2(x).  The function plot is easy but I don't know how to plot and color regions in 2D. The only solution I can think of is to sample points and use PLOT(POLYGONS())......

Is there any other ( easier !! ) ways to do this?

Thanks

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