a tin box 1.5 m long 1.25 m wide and 65 cm deep it to be open at the top. ignoring the thickness of the sheet, dtermine the area of the sheet required to make the box.

Question

find the area of the sheet required to make the box

Answer 1

The box's dimensions are L=1.5m, W=1.25m and H (or depth) =0.65m. There are 5 faces, because the top is absent.

We have to work out LW (base) + 2LH + 2WH (sides and ends) = LW + 2H(L+W) = 1.5*1.25 + 2*0.65(1.5 + 1.25) = 1.875 + 1.30*2.75  = 5.45 sq m.

Just fold up the sides and ends around the base to make the box.