Yes, it's just doubled in size.
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A rectangle has 2 pairs of equal sides, so it would be 2X2+2X4=12
To cover a rectangle-shaped floor measuring 16x12, you will need 6 4x8 sheets of plywood. Arrange the sheets so that the longer side of the sheets line up along the longer edge of the floor.
6
576
Similar polygons have congruent angles and the same shape (but not necessarily the same size). Since the shape of a square and a rectangle is different from the shape of a trapezoid, they are not similar to it.