Question

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

Answer 1

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