Given: Side of each cube = 10 cm Formula: Total surface area of cuboid =2(lb+bh+hl) Calculation: Length of cuboid =10+10=20 Breadth of cuboid =10cm Height of cuboid =10cm Total surface area of cuboid =2(20×10+10×10+10×20) ⇒2×(200+100+200) ⇒2×500 ⇒1000cm2