Rectangles are two-dimensional and you've given us three dimensions, so we'll assume it's some kind of rectangular prism.
2 x 12 x 10 = 240
2 x 12 x 8 = 192
2 x 10 x 8 = 160
240 + 192 + 160 = 592 square cm
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multiply length and width,then width and height,then height and width then add your answers together the double it.
A rectangle is a two dimensional object: height, width and length are three dimensions.
length is base and height is width
A rectangle has only two dimensions, for example, length and width. The longest side is usually called the length, the other side, the width.
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