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The formula for surface area Is lengthxwidth, widthxheight, lengthxheight i.g: length: 23cm 2 width: 13cm2 height:14cm2 The formula would be: 2(23x13) x 2(13x14) x 2(23x14) = 2(299)x 2(182) x 2(322)= 598+ 364 + 644= The surface area is 1,606 cm2