Question

a tin 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 sheet determine the area of the sheet required to make the box

Answer 1

We have length = 1.5 m

Breadth = 1.25 m

Height = 0.65 m

i)  Since it is open at the top therefore plastic sheet required for making box

= 2( l + b)  *h + lb

= 2( 1.5 + 1.25 ) * 0.65 + 1.5 * 1.25

= 2 * 2.75 * 0.65+ 1.875

= (3.575 + 1.875 )m2 =  5.45 m2



hope it help you

Answer 2

L = 1.5 m
B = 1.25 m
H = 65 cm = 0.65 m
Surface area of box = lateral surface area of cuboid + base area = 2h ( L + b) + Lb = 2 * 0.65 ( 1.5 + 1.25 ) + 1.5 *1.25

= 1.30 (2.75 )+ 1.875
=3.5750 + 1.875
== 5.45 m sq