find the total surface area of a cuboid sirface lenth breath amd hight 12cm 18cm and 13cm
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2(12*18+18*13+13*12)=1212cm2
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Total surface area=2 (lb+bh+lh)
=2 (12×18+18×13+12×13)
=2 (216+234+156)
=2×606
=1212
=2 (12×18+18×13+12×13)
=2 (216+234+156)
=2×606
=1212
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