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Lp = 2 (pxl +pxt + lxt)
= 2 (15x6 + 15x8 + 6x8)
= 2 ( 90 + 120 + 48 )
= 2 ( 258 )
= 516 cm²
volum = p x l x t
= 15 x 6 x 8
= 720 cm³