Q5 of 94 Page 231

Find the surface area of a chalk box, whose length, breadth and height are 18 cm, 10 cm and 8 cm respectively.

Given that,

Length = 18 cm


Breadth = 10 cm


Height = 8 cm


We know that,


Total surface area of cuboid = 2 (lb + bh + hl)


= 2 (18 × 10 + 18 × 8 + 10 × 8)


= 2 (180 + 144 + 80)


= 808 cm2


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