Question: The length, breadth and height of a cuboid are 20cm , 15cm and 10cm respectively. Find its total surface area. L = 20cm , B = 15cm , H = 10cm
(A) 1300 cm²
(B) 1200 cm²
(C) 1100 cm²
(D) 1500 cm²
Solution
Surface area of cuboid = 2( lb + bh + hl)
= 2(20×15+15×10+10×20)cm²
= 2(300 + 150 + 200)cm²
= 2(650)cm² = 1300 cm²
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