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On the 2 dimensional xy plane, the closed, simple, piece wise curve is C1 along the x axis from x=0 to 1, C2 along the line y= 2-2x is between x=0 to x=1 and y=0 to y=2, and C3 is along the y axis from y=0 to y=2.

Besides the boundary curve, it is very difficult for me to see the 3 dimensional Surface bounded by this curve.

HELP