A cube!!
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False on two counts. A rectangular shape is 2-dimensional and so can have no mass. If it is rectangular but has length, width and height then it is a cuboid object. Then, multiplying the length width and height will give the volume, not the mass.
That is how you find the volume of an object.
Volume = Length * Width * Height.
Well, honey, a square is a two-dimensional shape, so it doesn't have height like a three-dimensional object would. It does have length and width, but height is a whole other ball game. So, technically, a square doesn't have height, but nice try!