Since we haven't seen the rectangle and you haven't described it to us, we'd only be guessing.
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A rectangle is a whole shape and so there is no fraction.
Maybe... the fraction of the rectangle and the large rectangle makes both of them to represent so that they can connect back together again.
2
1 - 1/3 = 2/3 So, two-thirds would be unshaded.
A rectangle has NO faces. A rectangle has FOUR(4) Sides.