Question

An iron box 1.5 m long, 1.25 m wide and 65 cm deep, is to be made. It is to be open at the top. Ignoring the thickness of the plastic sheet, determine the area of the sheet required for making the box.

• A. $5.45{\text{m}}^2$
• B. $6.45{\text{m}}^2$
• C. $5.65{\text{m}}^2$
• D. $5.85{\text{m}}^2$

Answer 1

The correct option is A $5.45{\text{m}}^2$

It is given that, length (l) of box = 1.5 m.
Breadth (b) of box = 1.25 m.
Depth (h) of box = 0.65 m.
Box is to be open at top.
Area of sheet required
= 2lh + 2bh + lb
$=[2\times 1.5\times 0.65+2\times 1.25\times 0.65+1.5\times 1.25]m^2$
$=(1.95+1.625+1.875){\text{m}}^2$
$=5.45{\text{m}}^2$