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

Length = 18 cm
Breadth = 10 cm
Height = 8 cm
∴ Total surface area $=2\left(lb+lh+bh\right)=2\left(18\times 10+18\times 8+10\times 8\right)=2\left(180+144+80\right)=808c{m}^2$