T=468 cm$^2$ V=648 cm$^3$
Work Step by Step
l=3+w 360=2(12)(w)+2(12)(3+w) 360=24w+72+24w 48w=288 w=6 l=3+6=9 T=360+2(9)(6) T=360+108 T=468 V=6(9)(12) V=648
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